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San Antonio Heat Pumps
Look at the outdoor units in an all-electric subdivision on the northeast side, in Cibolo or in the newer parts of Schertz and Converse, and most of them are heat pumps. The logic is simple. A heat pump is an air conditioner with a valve that lets it run backwards, so the same equipment that carries the enormous cooling load from April to October also heats the house on the mild mornings that make up most of a San Antonio winter. For a climate that spends far more time at 98 than at 28, it is a sensible way to build a house.
The catch is the exception. When a hard freeze settles over Bexar County, as it did in February 2021, a heat pump loses capacity as the outdoor temperature drops and falls back on electric heat strips. Those strips work, but they cost several times more to run, and if they have never been tested they may not work at all. A well-maintained heat pump with correctly wired auxiliary heat handles a freeze fine. A neglected one is where the no-heat calls come from. We have installed and serviced heat pumps across the metro since 1999.
How the refrigeration cycle reverses, what a defrost cycle is, and how auxiliary heat is supposed to behave are all explained on our heat pumps page. What follows is what matters for a heat pump in this city.
Something Off?
Because a heat pump works year-round, its faults show up in both seasons. Here is how to read them.
A normal defrost cycle, and a good sign on a frosty day. If the unit is caked in ice that never clears, the defrost control has failed.
The strips are carrying the load the heat pump should. A low charge, a failed outdoor fan or a thermostat wired wrong, and a large electric bill either way.
A stuck reversing valve, the one part a heat pump has that a plain air conditioner does not.
The same humidity issues as any San Antonio AC: oversizing, fan settings, a dirty coil or a charge that has slipped.
Some noise at the reversing valve is normal. A new bang, rattle or continuous hiss is a call.
A heat pump logs more hours than any other system in the house. A loss of capacity shows on the bill in summer and winter alike.
What We Do
Repair, seasonal maintenance and new installations, including replacing a furnace-and-AC pair with a single heat pump.
What to Expect
Whether it is a no-heat call in January or a replacement estimate in October, you know the price before we start.
Which mode, what the thermostat shows, and whether the outdoor unit is running. We book the soonest window, any hour.
Refrigerant pressures, reversing valve operation, defrost control, strip heat amperage and thermostat logic.
Repair price, and replacement numbers if the unit is near the end. Honored for 72 hours with no hidden fees.
We run the system in heating or cooling, confirm auxiliary heat behaves, and back the work with the Home Comfort Guarantee.
Save on the work your home needs most.
Summer or winter, the diagnosis comes with a price you approve first.
Don't just take our word for it — hear from our satisfied customers
Maintenance Membership
Home maintenance for $9.99 a month.
Care Club members get two HVAC tune-ups and a plumbing safety inspection every year, priority scheduling, no dispatch fees — ever — and 5% off every repair.
Yes, with a caveat. As the outdoor temperature drops into the 20s, a standard heat pump extracts less heat from the outside air and calls on its electric auxiliary strips to make up the difference. If those strips are sized correctly, wired correctly and working, the house stays warm; it just costs more to run for those few days. During February 2021 the homes that struggled were usually ones where the strips had failed silently, the thermostat was not staging them in, or the outdoor unit had a pre-existing fault. That is why we test auxiliary heat at every fall tune-up. Newer cold-climate heat pumps hold capacity to lower temperatures than older models, and a dual-fuel setup with a gas furnace as backup removes the concern entirely.
Not quite. Auxiliary heat is automatic: the thermostat turns on the electric strips alongside the heat pump when the heat pump alone cannot keep up, then turns them off again. Emergency heat is a manual setting that shuts the outdoor unit off completely and runs the strips by themselves. Use emergency heat only when the outdoor unit has failed or is iced solid and you are waiting for a repair; it will keep the house warm but at a much higher cost. If you find the emergency heat setting was left on from last winter, that explains a high bill. If the aux indicator is on during mild weather when you have not touched anything, the heat pump has a problem and it is worth a call.
Without a gas line, your practical choices are a heat pump or an electric furnace, which is just a blower with heat strips. Of the two, the heat pump is far cheaper to run for most of a San Antonio winter, because it moves heat rather than generating it. An electric furnace uses the strips for every minute of heating, which is what a heat pump does only during a freeze. If your current system is an electric furnace paired with a straight air conditioner, replacing the pair with a heat pump at the next changeout is usually the right move. We will price it against a like-for-like replacement so you can see the difference in writing, and financing through Service Finance Company is available, subject to credit approval.
Less time than the same unit would last somewhere it only ran half the year, because a heat pump here works the long cooling season and then keeps working through winter. Maintenance is what stretches that life: a clean outdoor coil, a correct refrigerant charge, working defrost and strips, and a drain that does not back up. Two tune-ups a year, one before summer and one before winter, is the schedule we recommend, and it is what Care Club provides for $9.99 a month. When a heat pump does reach the end, the signs are the same as for any air conditioner: rising bills, repeated repairs and a compressor that struggles to start on a hot afternoon.