Every no-heat call includes a full diagnostic, not just a parts swap. Here is what is covered in a standard Heat Pump Not Heating Repair McLean VA visit, and what we quote separately only when the job actually requires it.
We test refrigerant pressures with a manifold gauge set, compressor amperage with a clamp meter, capacitor microfarads, thermostat calibration, and defrost cycle timing. This is how we find the real fault instead of guessing at the most common part.
If pressures are low, we use a leak detection electronic detector to find the exact leak point. We repair the leak, then evacuate and recharge with a vacuum pump and refrigerant recovery machine using R-410A or R-32 as the system requires.
Capacitors, contactors, control boards, and wiring get tested with a multimeter before anything is replaced. Failed components are swapped with matching parts, and we verify correct operation through a full heating cycle before we leave.
A heat pump can heat perfectly and still feel cold if airflow is restricted. We check the air filter, inspect the blower motor, and measure static pressure with a duct pressure gauge. Restricted ducts get flagged so you know whether airflow is part of the problem.
We confirm the defrost control board engages and terminates correctly, since a failed defrost cycle is one of the top reasons a heat pump stops heating in winter. If the board or its sensors are bad, we replace them and retest.
After the repair, we run the system through a complete heating cycle, measure supply-air temperature at the registers, and confirm the outdoor unit is not short-cycling. You get a walkthrough of what failed and what to watch for going forward.
Heat Pump Not Heating Repair McLean VA is a diagnostic and mechanical repair service that restores warm airflow when a heat pump runs but never actually heats the house. In heating mode, the reversing valve flips the refrigerant flow so the outdoor coil absorbs heat and the indoor coil releases it. When that cycle breaks, you get a fan blowing room-temperature or cold air, a frozen outdoor unit, or a system that short-cycles every few minutes. We test refrigerant pressure with a manifold gauge set, check the capacitor and contactor, verify thermostat calibration, and confirm the defrost control board is switching properly.
Most McLean calls we run start the same way: the thermostat is set to heat, the indoor fan is running, and the air coming out of the vents is cold. That points to a refrigerant leak, a stuck reversing valve, or a failed defrost cycle. Homes in Chesterbrook and Langley Forest with older Carrier and Goodman units hit this more often after a long cooling season. If you are searching for a heat pump not blowing hot air McLean VA near me, we can usually be on site the same day and give you a straight answer on what failed.
No mystery, no runaround. Here is the exact path from your first call to warm air coming out of the vents again.
Schedule
Call or book online — a real human picks up and confirms a 2-hour arrival window.
Diagnose
Licensed tech inspects on-site, then walks you through the cause and your options.
Fix
The job is completed to code and done right the first time — no shortcuts, no surprises.
Guarantee
Every job backed by a written workmanship warranty — and we stand behind it.
Manifold Gauge Set
Reads high-side and low-side refrigerant pressures so we can tell whether the system is undercharged, overcharged, or blocked. It is the first instrument on every no-heat call.
Leak Detection Electronic Detector
Pinpoints refrigerant leaks at joints, valves, and coils. Finding the exact leak point is what separates a real repair from a temporary top-off that fails again next season.
Clamp Meter and Multimeter
Measures compressor and fan motor amperage, checks capacitor microfarads, and tests control board voltage. These readings tell us which component actually failed instead of guessing.
Vacuum Pump and Refrigerant Recovery Machine
Used whenever the sealed system is opened. We recover refrigerant, pull a deep vacuum to remove moisture, then recharge with R-410A or R-32 to the manufacturer's specification.
Duct Pressure Gauge
Measures static pressure in the ductwork to catch airflow imbalance that can make a working heat pump feel like it is not heating. Restricted ducts get flagged for sealing or balancing.
Coil Cleaning Pump and Fin Comb
Cleans and straightens the outdoor coil fins. A dirty or bent coil reduces heat absorption and forces the system to run longer and hotter than it should.
Thermostat Calibration Tool
Verifies the thermostat is reading and calling for heat accurately. A thermostat that is off by several degrees can keep a perfectly good heat pump from heating the house.
NATE-certified diagnostic sequence
We follow a set order: thermostat call, indoor airflow, refrigerant pressures, electrical components, then defrost and reversing valve operation. Working in sequence prevents the common mistake of replacing a part before confirming it failed.
EPA Section 608 refrigerant handling
All refrigerant work follows EPA Section 608 rules for recovery, evacuation, and charging. We never vent refrigerant, and we charge by weight or subcooling to the manufacturer's spec, not by guesswork.
Fairfax County permit compliance
When a repair or replacement requires a permit, we pull it through Fairfax County and schedule the inspection. Code-correct work protects you at resale and keeps the installation compliant with Virginia mechanical code.
AHRI-certified parts matching
Replacement components and equipment are matched to AHRI-certified combinations wherever possible. Mixing mismatched parts is a common cause of repeat failures and lost efficiency.
OSHA safety compliance
Electrical lockout, refrigerant handling, and ladder work all follow OSHA safety compliance. It keeps our technicians safe and keeps your home and equipment protected during the repair.
01
What we do: We run 24/7 emergency dispatch for no-heat calls. A technician arrives with a full diagnostic kit, identifies whether the issue is refrigerant charge, a defrost fault, or a reversing valve, and repairs what can be fixed on the spot.
→ Most overnight no-heat calls are restored to heating the same night, with the house back to temperature before morning.
02
What we do: We test refrigerant pressures and compressor amperage, then check the defrost cycle and airflow. A slow refrigerant leak or a weak capacitor is often the culprit, and both are repairable without replacing the unit.
→ The system returns to normal heating cycles, and the homeowner avoids a replacement quote they did not actually need.
03
What we do: We schedule a same-day diagnostic, repair the failed component, and provide clear documentation of what was fixed. If a part needs ordering, we give a firm lead time and set the return visit before leaving.
→ The tenant has heat restored quickly, and the landlord has a written record of the repair for the property file.
04
What we do: We run our own diagnostic from scratch: refrigerant charge, reversing valve operation, control board, and electrical components. If the fault is a capacitor, contactor, or leak, we repair it and show you the readings.
→ Many of these homes get a repair in the hundreds of dollars instead of a full replacement in the thousands.
McLean sits in Fairfax County, where winters swing between mild stretches and hard freezes that push heat pumps to their limits. The housing stock matters too. Older homes in Salona Village and Old Chesterbrook often have original ductwork with undersized returns, which chokes airflow and makes a heat pump work harder than it should. Newer builds in The Reserve and Woodside Estates tend to have tighter envelopes and correctly sized systems, so when those stop heating, it is almost always a mechanical fault like a reversing valve or defrost control board rather than a sizing problem. Virginia's freeze-thaw cycles are also hard on outdoor units, and we see more frozen coil and defrost cycle failures here than in warmer parts of the state. If you are dealing with an HVAC heat pump not heating McLean Virginia issue in the middle of a cold snap, call us early. Catching a refrigerant leak or a failing capacitor before the compressor overheats usually turns a major repair into a minor one.
Chesterbrook
A mix of mature homes and townhomes where older heat pumps and original ductwork are common. Airflow problems here often mask a simple refrigerant or capacitor fault.
Langley Forest
Larger homes with zoned systems and multiple heat pumps. When one zone stops heating, it is usually a zone valve, thermostat, or reversing valve issue rather than a whole-system failure.
Downtown McLean
A denser mix of condos and older houses. Rooftop and closet-mounted units here need careful access planning, and we bring the right equipment for tight spaces.
The Reserve
Newer construction with modern, correctly sized heat pumps. No-heat calls here typically trace to a control board, thermostat, or refrigerant charge issue rather than ductwork.
West McLean
Tree-heavy lots mean more debris in outdoor coils each fall. Clogged coils and restricted airflow are a recurring cause of heating problems we see in this area.
Hard overnight freezes in January and February
Heat pumps run longer defrost cycles and work near their capacity limit. Systems with a weak capacitor, low refrigerant charge, or failing defrost board tend to fail on the coldest nights, which is exactly when you need heat most.
Freeze-thaw cycles through winter
Repeated freezing and thawing stresses outdoor coils, fan motors, and drain lines. We see more frozen coil and condensate drain problems in McLean than in areas with steadier winter temperatures.
Older ductwork in established neighborhoods
Undersized returns and leaky ducts reduce airflow, which makes a heat pump run hotter and longer. Balancing airflow or sealing ducts often restores comfort without touching the refrigerant system.
Heavy tree canopy and fall leaf drop
Debris collects in outdoor coils and blocks airflow. A dirty coil reduces heat absorption and can trigger defrost faults, so we clean and inspect coils on most fall and winter calls.
Most no-heat calls trace back to one of a handful of failures. Here is what we see most often in McLean and how we handle each one.
Problem
The house loses heat steadily, and the system runs constantly without ever reaching the thermostat setpoint. Electric resistance backup heat, if it engages at all, drives the power bill up fast.
Our Fix
We test the reversing valve first, since a stuck valve is the classic cause of cold air in heat mode. If the valve is fine, we check refrigerant charge, the defrost control board, and thermostat settings. Most of these calls are resolved the same day with a valve, board, or charge repair.
Problem
Ice blocks the coil, heat absorption stops, and the system either runs endlessly or shuts down on a safety lockout. Left alone, ice can damage the fan blades and coil fins.
Our Fix
We diagnose why the defrost cycle is not clearing the coil, whether it is a failed defrost control board, a bad sensor, or low refrigerant. After the repair, we verify the defrost cycle engages and terminates on schedule so ice does not rebuild.
Problem
Short cycling wears out the compressor and contactor, raises energy use, and never lets the house reach a comfortable temperature. It is often a sign of a refrigerant or control problem getting worse.
Our Fix
We check refrigerant charge, thermostat calibration, and the control board for fault codes. A low charge, a failing capacitor, or a thermostat reading the wrong temperature all cause short cycling, and each has a different fix. We confirm the cause before replacing anything.
Problem
If the outdoor fan never spins up, the compressor overheats and the system locks out. You get cold air indoors and a unit that sounds like it is trying to start but cannot.
Our Fix
This usually points to a failed fan motor, capacitor, or contactor. We test each with a multimeter and clamp meter, replace the failed part, and confirm the fan and compressor start correctly. Most of these repairs are done in a single visit.
A heat pump that will not heat is rarely a mystery once the right gauges and meters are on it. Here is what you get when you book Heat Pump Not Heating Repair McLean VA with us.
Same-Day Warm Air
Most no-heat calls in McLean are diagnosed within 90 minutes of arrival. We carry R-410A and R-32 refrigerant, capacitors, contactors, and common reversing valve parts on the truck, so roughly 7 out of 10 jobs are finished in a single visit instead of waiting days for a part order.
Real Diagnostic Testing
We do not guess. A clamp meter and multimeter confirm whether the compressor is drawing correct amperage, a leak detection electronic detector pinpoints refrigerant loss, and a duct pressure gauge shows whether airflow imbalance is masking the real fault. You get the actual failed component, not a parts cannon.
Emergency Heat Pump Repair
When the temperature drops below freezing overnight, a heat pump blowing cold air in heat mode McLean becomes urgent. We run 24/7 emergency dispatch for no-heat calls, and we prioritize homes with infants, elderly residents, or medical equipment that depends on steady warmth.
Repairs That Hold
Every repair is tested through a full heating cycle before we pack up. We verify supply-air temperature at the registers, check the defrost cycle timing, and confirm the system holds pressure. If a compressor or control board failure needs a bigger fix, we explain the cost difference between repair and replacement in plain numbers.
Typical 2026 pricing for Heat Pump Not Heating Repair McLean VA runs $180 to $450 for common electrical fixes like a capacitor, contactor, or thermostat, and $650 to $1,800 when a reversing valve, blower motor, control board, or compressor is involved. Refrigerant leak repair with evacuation and recharge usually lands between $400 and $1,200 depending on how much refrigerant the system holds. You get the exact price before we start, and if a repair does not make financial sense on an old unit, we tell you straight and quote replacement instead.
Typical Investment Range
$180 - $1,800 depending on the failed component and refrigerant work
A repair in the hundreds is almost always cheaper than a replacement in the thousands. We only recommend a new system when the repair cost approaches half the price of replacement on an aging unit, and we show you the numbers behind that call.
What changes the price
Failed component
A capacitor or contactor is a quick, low-cost fix. A reversing valve, blower motor, or control board takes more labor and a more expensive part. Compressor failure is the most expensive diagnosis and sometimes tips the decision toward replacement.
Refrigerant type and charge
Systems using R-410A and older R-22 replacements cost differently than newer R-32 units. The amount of refrigerant needed, plus leak repair, drives the total. We charge by weight to the manufacturer's spec, never by guesswork.
System age and condition
A 6-year-old heat pump is usually worth repairing. A 16-year-old unit with a failed compressor often is not. We give you both numbers and let you decide, without pressure toward the more expensive option.
Access and location
Rooftop units, closet-mounted air handlers, and tight crawlspace access add labor time. We flag access issues during the phone call so the quote you get is the price you pay.
Emergency timing
After-hours and weekend no-heat calls carry a higher dispatch rate than standard business hours. If your system can hold until morning, a daytime appointment saves money without risking the compressor.
Google ★★★★★4.9
Called on a Sunday night with no heat and cold air blowing from every vent. They had a technician at the house within two hours, found a bad defrost board, and fixed it that night. Fair price, no upselling, and the house was warm by midnight.
Yelp ★★★★★4.8
Our heat pump stopped heating in January and another company wanted to replace the whole system. These guys found a refrigerant leak, repaired it, recharged the unit, and saved us thousands. Straightforward and honest from the first phone call.
BBB ★★★★★4.9
Professional from start to finish. They diagnosed a failed capacitor and contactor, replaced both the same day, and showed me the readings before and after. Clean work, clear explanation, and they honored the price they quoted on the phone.
Google ★★★★★5.0
We use them for maintenance on two heat pumps and they have caught small issues before they turned into no-heat emergencies. When our older unit did stop heating, they had it running again in one visit. Reliable and easy to schedule.
Our technicians hold NATE certification and EPA Section 608 certification, and we work under a Virginia HVAC contractor license with Fairfax County permits pulled whenever a job requires one. We service every major brand, including Carrier, Trane, Lennox, Mitsubishi Electric, Daikin, Bosch, Goodman, Rheem, American Standard, and Bryant. Reversing valve failures, defrost cycle problems, refrigerant leaks, and control board faults are the calls we run most, and we have seen every version of them across McLean's older housing stock and newer builds. We follow OSHA safety compliance on every job site and install AHRI-certified equipment when a replacement is the right call.
Real experiences from customers who chose our Heat Pump Not Heating services.
“Our heat pump was running but blowing cold air on a 28-degree night. They came out the same evening, found a stuck reversing valve, and had heat back by 10 p.m. The price they quoted on the phone was the price we paid. No runaround, no upsell on a new unit we did not need.”
David R.
Homeowner, Chesterbrook
“Two other companies told us we needed a whole new system. These guys tested the refrigerant, found a leak at a Schrader valve, fixed it, recharged the unit, and charged us a fraction of a replacement quote. That was last winter and it is still heating fine. Honest work.”
Priya M.
Homeowner, Langley Forest
“Our 14-year-old Carrier stopped heating in January. They diagnosed a failed defrost control board and a weak capacitor, replaced both the same day, and walked me through what to watch for. Showed up in the window they promised and cleaned up after themselves. We use them for maintenance now too.”
Tom K.
Homeowner, Salona Village
Real answers to the questions we hear most often from local homeowners and property managers.
General heat pump repair covers the full system, not just heating faults. If your unit has a refrigerant leak, a failing compressor, or a control board problem that shows up in both heating and cooling, this is the service that gets it sorted for McLean homeowners.
View Heat Pump RepairWhen a heat pump is too old or too damaged to repair economically, installation replaces it with an AHRI-certified unit sized for your McLean home. We handle Fairfax County permits, line-set sizing, and startup so the new system heats correctly from day one.
View Heat Pump InstallationTwice-a-year maintenance keeps a heat pump from failing in the first place. We clean coils, check refrigerant charge, test the defrost cycle, and replace filters. McLean homeowners who keep up with maintenance see far fewer no-heat calls in January.
View Heat Pump MaintenanceNo heat at 2 a.m. is an emergency. We run 24/7 dispatch for McLean and Fairfax County, prioritizing homes with infants, elderly residents, or medical equipment. A real technician answers, and we aim to be on site the same night.
View Emergency Heat Pump RepairThe mirror image of a no-heat call. If your heat pump runs in cooling mode but never drops the temperature, the same reversing valve, refrigerant, and compressor diagnostics apply. We fix both directions of the cycle in one visit when possible.
View Heat Pump Not CoolingA heat pump blowing cold air in heat mode usually means the reversing valve is stuck or the defrost cycle has failed. We test both, along with refrigerant charge and thermostat settings, to find out why the system is moving cold air instead of warm.
View Heat Pump Blowing Cold AirCall us any time at (571) 760-4593 for heat pump repair in McLean, Virginia. We answer live 24/7, book same-day appointments, and dispatch emergency calls across Fairfax County. You can also email info@mcleanheatpumppromasters.com or stop by the shop during regular hours.
Phone
(571) 760-4593Address
7321 Hooking Rd, McLean, VA 22101
Hours
Mon–Fri: 7AM – 7PM
Sat: 8AM – 4PM
Sun: Emergency Only
24/7 Emergency Available
