Rockville's trusted licensed HVAC pro — 376 five-star reviews
Your heat pump blows cool air in heating mode, or warm air when you want cooling.
Note: A heat pump that won't switch modes usually has a faulty reversing valve or a controls issue (thermostat wiring, control board). On older systems with a failed reversing valve, the repair cost vs. system age equation often makes replacement the smarter financial call. Efrain gives you the honest comparison.
See full service details →A reversing valve and controls diagnostic — with an honest assessment of repair vs. replacement.
“My heat pump blows cold air even when it's set to heat”
A heat pump blowing cold air in heating mode usually means the reversing valve is stuck in cooling position, or the auxiliary heat strips aren't engaging when outdoor temps drop. Both are diagnosable on-site. Reversing valve replacement costs $300–$700 and is often worth it on systems under 10 years old.
“My heat pump runs but the house won't warm up below 35°F outside”
Heat pumps lose efficiency as outdoor temperatures drop — below about 35–40°F, most systems need supplemental heat (electric strips or gas backup) to maintain setpoint. If your backup heat isn't engaging, that's a separate controls or electrical issue Efrain can diagnose.
“My heat pump has been running constantly for days and I'm worried about the bill”
Continuous running in winter is normal when it's very cold outside — heat pumps modulate output. Continuous running when it's 50°F outside signals a problem: low refrigerant, a failed reversing valve, or a controls issue preventing efficient operation. Efrain checks all three.
Describe the mode-switching symptom and outdoor temperature at the time
Efrain checks reversing valve operation, refrigerant charge, and controls sequence
Auxiliary heat function verified — strips or backup heat confirmed operational
Repair vs. replacement cost comparison provided for major component failures
Repair completed and both heating and cooling modes tested before Efrain leaves
All areas within Rockville, MD
Efrain diagnoses the root cause on-site and restores heat the same day in most Rockville cases.
Efrain finds the actual cause — refrigerant, electrical, or mechanical — and fixes it without guesswork.
A properly sized, licensed replacement — with real energy savings and a full warranty.
Call Infinite Heating & Air for a free estimate — same-day service available across Rockville, MD.