Heat Pump Not Heating or Cooling in Richmond TX? Here Is Why and What It Costs to Fix
A heat pump that is not working correctly puts Richmond TX homeowners in a frustrating position. During our short but real winter, a heat pump that blows cold air when it should be warming your home is more than uncomfortable. And during our very long, very hot summer, a heat pump that cannot keep up with the heat is a genuine problem.
What makes heat pump problems particularly confusing for homeowners is that most people are not entirely sure what a heat pump is or how it differs from a regular AC system or furnace. So when something goes wrong, the diagnosis feels mysterious. The system is running. It is making noise. Air is coming out of the vents. But the house is not comfortable.
This guide will explain what a heat pump actually does, why heat pumps in Richmond TX and Fort Bend County experience specific types of problems, how to recognize each one, and what a fair repair should cost in this area in 2026.
If you already know you need help and want a reliable HVAC company in Richmond TX today, call Temper Mechanical at (346) 485-8142. We diagnose and repair heat pumps throughout Fort Bend County with same-day service available.
What a Heat Pump Is and Why Richmond TX Is Actually a Great Place for One
A heat pump is a single system that handles both heating and cooling using the same equipment. In summer it works exactly like an air conditioner, pulling heat from inside your home and releasing it outside. In winter it reverses the process, pulling heat from the outdoor air and moving it inside.
That last part surprises many homeowners. Yes, heat pumps extract heat from outdoor air even in cold weather. The outdoor air does not need to be warm for this to work. Air contains heat energy down to very cold temperatures. A heat pump can extract useful heat from outdoor air at temperatures well below freezing, though efficiency does decrease as temperatures drop further.
This is why Richmond TX is genuinely well-suited to heat pump technology. Heat pumps are exceptionally well-suited to Richmond’s Southeast Texas climate. Our winters are mild enough that heat pumps operate at high efficiency throughout the heating season without the efficiency drop that colder northern climates cause.
Richmond’s extended cooling season typically runs from April through October, requiring air conditioning systems that can operate efficiently under extreme conditions. The heating season is short but real, with Sugar Land Regional Airport logging a January high of 61 degrees Fahrenheit and a low of 46 degrees Fahrenheit. Most heating systems here run two to four months a year.
The challenge with heat pumps in this climate is that they run in both directions year-round rather than sitting idle for a season. A heat pump in Richmond TX that handles both our long summers and our brief winters is operating for 12 months instead of the 6 to 8 months a furnace-only or AC-only system would run. Heat pumps average about $125 more per repair than standard AC systems because they have additional components, particularly the reversing valve, that do not exist in standard AC units. They also run year-round rather than seasonally, which means more wear and more frequent contact with the sealed refrigerant system.
Understanding that your heat pump works harder than most people assume helps explain why routine maintenance matters more for these systems than for traditional single-mode equipment.
How to Tell If Your Problem Is in Heating Mode, Cooling Mode, or Both
Before we get into specific causes, a quick diagnostic question will help you understand your problem better.
Test your system in both modes. Set your thermostat to heating mode and confirm whether it produces warm air. Then switch to cooling mode and confirm whether it produces cool air. Note which mode is failing and whether the problem is complete failure or reduced performance.
A system that fails in only one mode points toward specific components that are unique to heat pump operation, particularly the reversing valve. A system that fails in both modes points toward shared components like refrigerant, the compressor, or airflow. A system that runs but cannot keep up in either mode suggests efficiency problems rather than outright component failure.
This information is the first thing an experienced heat pump technician will ask about. Having it ready when you call saves time and leads to a faster diagnosis.
Cause 1: Capacitor Failure — The Most Common Heat Pump Repair in Richmond TX
Capacitor failure is the most common heat pump repair call, as it is for standard AC systems. The capacitor is a small electrical component that helps the compressor and fan motors start and run. It wears out faster in systems that run year-round.
Your heat pump has capacitors for both the compressor motor and the fan motor. These components store and release electrical energy to help motors start and maintain running speed. In Richmond TX’s climate, where your heat pump runs for more of the year than in most other parts of the country, capacitors experience more stress and wear out more frequently than manufacturers’ average lifespan estimates suggest.
Houston’s climate places unique and constant stress on heat pump systems. Unlike regions with predictable seasons, Houston-area homes experience extended periods of high heat and humidity followed by sudden temperature drops. This fluctuation forces heat pumps to operate in both cooling and heating modes more frequently than average. High humidity levels also cause moisture buildup within coils and drain systems, increasing the risk of corrosion, clogged condensate lines, and reduced heat transfer efficiency.
Signs of a failing capacitor include the outdoor unit humming but not starting when the system calls for heating or cooling, the system starting but shutting off quickly after beginning a cycle, a clicking sound when the thermostat calls for operation, and reduced heating or cooling performance that worsened gradually over several weeks.
Capacitor failure is one of the most repairable heat pump problems there is. The part is inexpensive and the replacement is straightforward for a licensed technician. This is also one of the situations where calling sooner rather than later matters. A capacitor that is failing but not fully failed is drawing abnormal current, which creates heat, which puts stress on the compressor motor. A compressor that overheats repeatedly because a failing capacitor is not providing proper starting power has its lifespan shortened.
Cost to fix: Capacitor replacement runs $150 to $400 including parts and labor. It is typically completed in a single visit.
Cause 2: Refrigerant Leak — When Your Heat Pump Loses Its Ability to Transfer Heat
Refrigerant is the substance that makes heat transfer possible in your heat pump. It cycles through the system absorbing heat in one location and releasing it in another. When refrigerant leaks out of the system, your heat pump loses the capacity to heat or cool effectively even though the motors and electrical components are working perfectly.
Leaks can develop over time due to corrosion in the coils, vibrations causing small cracks in the lines, or loose service valves, especially in our climate where units work harder, putting more stress on these components.
In Richmond TX’s humid environment, refrigerant coil corrosion is a specific concern. Formicary corrosion, which is caused by a chemical reaction between copper coil material, moisture, and certain organic compounds in the air, is more prevalent in humid Gulf Coast conditions than in drier climates. This type of corrosion creates pinhole leaks that are difficult to find without proper leak detection equipment.
A heat pump that gradually loses heating capacity over weeks or months likely has a refrigerant leak. Low charge reduces the system’s ability to absorb and transfer heat.
Signs of a refrigerant leak include your heat pump running continuously without reaching your thermostat setting in either mode, the system producing air that feels moderately conditioned but never reaches the temperature you have set, ice forming on the outdoor unit or refrigerant lines during summer operation, a slight hissing sound near the indoor or outdoor unit, and your energy bills rising without any change in usage.
Here is the critical thing most homeowners do not know: refrigerant does not get used up in normal operation. If your refrigerant is low, there is a leak somewhere. Simply recharging the refrigerant without finding and repairing the leak is money wasted, because the refrigerant will leak out again. A proper refrigerant repair involves leak detection, leak repair, and then recharge.
Cost to fix: Heat pump refrigerant leak repair runs $200 to $1,500 depending on leak location, refrigerant type, and recharge amount. R-410A systems cost $50 to $80 per pound to recharge. Older systems using R-22 refrigerant are significantly more expensive because that refrigerant is phased out and no longer manufactured domestically.
Cause 3: Reversing Valve Failure — The Problem That Only Heat Pumps Have
The reversing valve is the component that makes a heat pump fundamentally different from a standard AC system. It is a four-way valve that changes the direction of refrigerant flow, allowing the system to switch between heating and cooling modes. When you change your thermostat from cooling to heating, an electrical signal energizes a solenoid on the reversing valve, which shifts the valve and reverses the refrigerant flow direction.
When the reversing valve fails or sticks, the system either cannot switch modes at all or switches modes at the wrong time. This produces some of the most confusing heat pump symptoms homeowners encounter.
Failure to switch modes: if your system is stuck in cooling mode during a winter cold front or will not provide air conditioning during a July heat wave, the reversing valve is likely the culprit. This component is unique to heat pumps and requires specialized knowledge to repair.
When a Blue Norther cold front arrives, your system must quickly reverse operation, placing additional strain on reversing valves and compressors that may already be compromised from months of heavy cooling demand.
Richmond TX experiences occasional sudden temperature drops when cold fronts push through Fort Bend County. During these events, a heat pump needs to reverse modes quickly, and a reversing valve that has been weakening under stress may choose exactly this moment to fail.
Reversing valve problems present as your system cooling your home when you have set it to heat, your system blowing hot air when you have it set to cool, your system running without producing any temperature change in either direction, or your system performing well in one mode but failing completely in the other.
Because the reversing valve is unique to heat pumps and requires specific diagnostic procedures to test properly, not every general HVAC technician is experienced with this repair. Make sure whoever you call has specific heat pump experience and tests the system in both modes before recommending any parts replacement.
Cost to fix: Reversing valve replacement typically runs $450 to $1,200. It is one of the more involved heat pump repairs because the refrigerant system must be recovered, the valve replaced, and the system recharged and retested in both modes. Coastalecoheatair
Cause 4: Defrost System Problems — A Winter Issue That Confuses Homeowners
This one catches Richmond TX homeowners off guard because it involves something that looks alarming but is sometimes completely normal.
During heating season, your heat pump’s outdoor unit operates at temperatures below the surrounding air, causing moisture in the air to condense and potentially freeze on the outdoor coil. This is normal and expected. To address it, heat pumps have a built-in defrost cycle that periodically reverses operation briefly, heating the outdoor coil to melt accumulated ice.
During a defrost cycle, several things happen that can look like a malfunction: the outdoor fan stops, the system temporarily blows cooler air inside, steam may rise from the outdoor unit as ice melts, and you may hear different sounds from the system. All of this is completely normal and lasts only a few minutes before the system returns to heating mode.
What is not normal is a thick layer of ice that never melts, ice buildup during summer operation, the system staying in defrost mode for extended periods, or the outdoor unit being completely encased in ice.
Ice buildup on the outdoor unit: while some frost is normal during a defrost cycle in winter, a thick layer of ice during the summer indicates a serious problem with airflow or refrigerant levels that needs immediate intervention. An iced-up unit cannot transfer heat effectively, leading to poor performance and higher energy bills. If the problem is not resolved, it can eventually cause severe damage to the compressor.
When the defrost system itself fails, the ice never gets cleared and continues to build. The causes of defrost system failure include a faulty defrost thermostat or sensor that does not detect ice accumulation correctly, a failed defrost control board that does not initiate the defrost cycle, a reversing valve that does not respond to defrost commands, and low refrigerant that causes the coil to get colder than normal during normal heating operation, producing excessive ice.
Cost to fix: Defrost sensor replacement runs $150 to $300. Defrost control board replacement runs $200 to $500 depending on the system. If a refrigerant issue is causing abnormal icing, that adds to the cost per the refrigerant repair estimates above.
Cause 5: Dirty Coils and Restricted Airflow — The Slow Performance Killer
This cause does not produce a sudden failure. It produces a gradual decline in performance that homeowners often attribute to an aging system when the actual problem is maintenance-related.
Your heat pump has two coils: the indoor evaporator coil and the outdoor condenser coil. Both need to transfer heat efficiently for the system to operate at rated capacity. When either coil gets covered in dirt, debris, dust, mold, or biological growth, the heat transfer rate drops. The system runs longer to achieve the same result, uses more energy, and eventually cannot achieve your set temperature even running continuously.
In Richmond TX’s humid climate, the indoor coil is particularly susceptible to biological growth. Moisture that condenses on the cold coil during summer cooling creates conditions where mold and mildew can establish. Fort Bend County’s high pollen counts, combined with the large volumes of air your system moves through the coil, mean that even with regular filter changes, the coil accumulates deposits over time.
The outdoor coil faces different threats. Grass clippings from mowing, cottonwood fluff, airborne debris, and in some neighborhoods, significant amounts of windborne soil, all pack into the fin array of the outdoor coil and reduce airflow. A coil that is operating at 70 percent airflow capacity delivers noticeably less heating and cooling than a clean coil.
Airflow problems extend to your ductwork as well. Disconnected, leaking, or undersized return ducts reduce the volume of air your system can move, creating the same performance degradation as a dirty coil.
Signs of coil or airflow problems include your energy bills increasing gradually over a season, reduced airflow from supply vents, the system running almost continuously without reaching your thermostat setting, and ice forming on the indoor coil from reduced airflow across the cold surface.
Cost to fix: Professional coil cleaning runs $150 to $350 for a thorough indoor coil cleaning and $100 to $250 for the outdoor coil. Our heating repair service in Richmond TX includes coil condition assessment as part of every heat pump diagnosis.
Cause 6: Compressor Failure — The Most Expensive Heat Pump Repair
The compressor is the heart of your heat pump. It pressurizes the refrigerant and drives the entire heat transfer cycle in both heating and cooling modes. When the compressor fails, the system has refrigerant, it has power, but it cannot do anything useful with either.
Compressor failure in Richmond TX heat pumps has specific contributing causes. Running a system with low refrigerant for an extended period is the most common. Low refrigerant means the compressor is working against incorrect pressures, generating abnormal heat, and running without the lubrication that refrigerant carries through the system. This is why catching and repairing a refrigerant leak promptly matters so much. A refrigerant repair that costs $300 to $500 can prevent a compressor failure that costs $1,500 to $2,800.
The compressor gets overworked trying to compensate when refrigerant levels drop. While a minor leak can sometimes be repaired, a significant leak, especially one that has led to compressor damage, often necessitates a full system replacement.
Signs of compressor problems include the outdoor unit humming but the fan not running, the system failing to produce any heating or cooling despite the indoor air handler running, loud banging, grinding, or clicking from the outdoor unit at startup, tripped breakers that reset but trip again when the system tries to run, and in some cases, the system operating briefly before shutting down on thermal protection.
Compressor failure is where the repair versus replacement conversation becomes most important. At $800 to $2,800 for compressor replacement, this repair approaches or exceeds the cost of a new system on older units. Before approving a compressor replacement, ask your technician to run the repair versus replacement numbers with you.
Cost to fix: Compressor replacement runs $800 to $2,800 depending on the system size and compressor type. This is the point at which replacement often becomes more financially sensible than repair for systems over 10 years old.
Honest Heat Pump Repair Cost Summary for Richmond TX in 2026
Here are the repair costs for all six causes in one place, based on current Houston-area labor rates.
Heat pump maintenance costs $70 to $200 for a tune-up visit, while heat pump repair costs $150 to $650 for minor repairs and up to $2,500 or more to replace major parts.
Diagnostic visit: $75 to $200. Applied toward the repair cost if you proceed with us.
Capacitor replacement: $150 to $400.
Refrigerant leak detection, repair, and recharge: $200 to $1,500 depending on leak location and refrigerant type.
Reversing valve replacement: $450 to $1,200.
Defrost sensor replacement: $150 to $300.
Defrost control board replacement: $200 to $500.
Coil cleaning, indoor and outdoor: $150 to $600 for both.
Compressor replacement: $800 to $2,800.
Check our current HVAC repair special for Fort Bend County homeowners before you call. We regularly run discounts on service calls.
Repair vs Replace: The Decision Framework for Richmond TX Homeowners
When a heat pump repair approaches or exceeds the cost of a new system, the conversation shifts. Here is the framework most experienced HVAC technicians in this area use.
The rule of thumb: if the repair is more than 50 percent of replacement cost and the system is over 12 years old, replacement usually wins. Especially since modern heat pumps are dramatically more efficient and qualify for significant rebates. Lantz Home Services
For Richmond TX specifically in 2026, replacement becomes worth considering when:
Your system is over 10 to 12 years old and needs a major repair such as compressor or reversing valve replacement. Your energy bills have been climbing steadily even during moderate weather periods, suggesting efficiency loss. You are facing a compressor replacement on a system with existing refrigerant or other issues that the compressor repair does not address.
On the rebate side: Richmond and Fort Bend County sit in CenterPoint Energy’s service territory, where qualifying SEER2 16 or higher heat pump replacements earn up to $500 under the 2026 Standard Offer Program, with up to $75 available on qualifying smart thermostats.
If replacement is in your near future, the CenterPoint Energy rebate program available to Fort Bend County homeowners changes the financial picture meaningfully. Ask us about current qualifying models and rebate application when we come out for your diagnosis.
What to Check Before You Call
A few things you can verify yourself in 10 minutes that may resolve the issue or at least help the technician when they arrive.
Check your thermostat settings. Confirm it is set to the correct mode, heating or cooling, and that the set temperature is actually above or below the current room temperature respectively. A thermostat set to cooling at 74 degrees in a 72-degree house will not run.
Replace your air filter if it has been more than 4 weeks since the last change. A severely clogged filter can cause your system to ice up, shut down on high-limit protection, or blow air that feels barely conditioned. In Richmond TX’s humid summer, filters fill faster than manufacturers’ schedules typically account for.
Check your circuit breaker. Both the indoor air handler and outdoor unit typically have their own breakers. If either has tripped, reset it once and observe whether the system starts. If it trips again, do not reset it a second time. A repeatedly tripping breaker indicates an electrical problem that needs diagnosis.
Check the outdoor unit. Make sure nothing is blocking it. Confirm the fan blade is turning when the system operates. If you can see the fan and it is not spinning while the compressor is running, a capacitor or fan motor issue is likely.
If you have checked all of these and the system is still not working correctly, it is time to call.
Why Heat Pump Diagnosis Requires Both Modes to Be Tested
This is worth explaining because it affects the quality of the repair you receive.
A heat pump that is tested in only one mode may receive a partial repair that solves the presenting complaint but leaves an underlying issue unaddressed. A reversing valve that is partially stuck may allow the system to cool adequately while causing subtle heating problems. A refrigerant leak that reduces heating efficiency may not be as obvious during a summer diagnosis when the system is mostly cooling.
Every heat pump diagnosis we perform at Temper Mechanical includes testing in both heating and cooling modes before any parts are recommended. We photograph and document our findings, explain what each issue means, and give you the complete picture before any work begins.
This is not always the standard in the industry. Ask whoever you call whether they test heat pumps in both modes as part of their diagnostic process. The answer tells you a lot about their experience with these systems specifically.
Serving Richmond TX, Sugar Land, Pecan Grove, and All of Fort Bend County
Temper Mechanical is a family-owned HVAC company based right here in Richmond TX. We have serviced heat pumps throughout Fort Bend County long enough to understand the specific wear patterns that our climate and humidity conditions create in these systems.
Our technicians carry the most common heat pump repair components on every truck, including capacitors, contactors, defrost controls, and refrigerant, so most repairs can be completed in a single visit.
4.9 stars from 165 Google reviews from your neighbors in Richmond, Sugar Land, Pecan Grove, Rosenberg, and Cinco Ranch.
We also serve homeowners throughout Fort Bend County including Sugar Land TX and Pecan Grove TX with the same same-day commitment.
For any AC-specific concerns alongside your heat pump, visit our AC repair Richmond TX page for information on cooling system repairs specifically.
Get Your Heat Pump Diagnosed Today
Heat pump problems rarely resolve themselves and in most cases they worsen when left unaddressed. A capacitor that is failing draws extra current that stresses the compressor. A refrigerant leak that continues unchecked damages the compressor from running low. The problems that are inexpensive to fix early become expensive to fix when they are allowed to progress.
If your heat pump is not heating or cooling the way it should in Richmond TX, get a professional diagnosis before the problem becomes a replacement conversation.
Call Temper Mechanical now: (346) 485-8142
Same-day heat pump diagnosis and repair available throughout Richmond TX, Sugar Land, Rosenberg, Pecan Grove, Cinco Ranch, and Fort Bend County. We answer 7 days a week.
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Temper Mechanical Air and Heat LLC | 6115 FM 762 Rd Suite 1200, Richmond TX 77469 | (346) 485-8142