There is a stretch of the Sacramento Valley calendar, roughly late September into October, when a home needs a little heat at 6 a.m. and a little cooling by 4 p.m. It confuses thermostats, it confuses homeowners, and it is the single best argument for a heat pump.
Heat pumps are still misunderstood, partly because the name sounds like they only heat and partly because a lot of what people have heard about them comes from much colder climates. Here is how they actually behave in a place like Roseville.
A heat pump moves heat instead of making it
A gas furnace creates heat by burning fuel. A heat pump does not create heat at all. It moves heat from one place to another using refrigerant, a compressor, and two coils, which is exactly what your air conditioner already does.
In cooling mode, it pulls heat out of your indoor air and dumps it outside. In heating mode, a reversing valve flips the direction of the refrigerant flow, and the same machine pulls heat out of the outdoor air and brings it inside. There is usable heat in 45-degree air, and a heat pump’s job is to concentrate it.
Because moving heat takes less energy than generating it, a heat pump can deliver more heating energy than the electrical energy it consumes. That is the efficiency story in one sentence, and it is why heat pumps get so much attention.
Why the valley climate suits them
Heat pump efficiency depends on the temperature difference it is working across. The colder it is outside, the less heat there is to harvest and the harder the system works.
In much of the country that becomes a real limitation. In the Sacramento Valley, our winter lows are mild by national standards, which puts a heat pump in its comfortable operating range for most of the heating season. Our long, hot summers also mean the cooling side gets heavy use, so you are getting full value out of one piece of equipment across the whole year.
The shoulder season is where the advantage is most obvious. A heat pump can switch between heating and cooling within the same day without you doing anything but setting a temperature.
What to check on a heat pump before heating season
The critical point about heat pumps is that half of their functionality has been asleep all summer. You have been running the cooling half since May. The heating half, the reversing valve and the defrost cycle and the auxiliary heat, has not been asked to do anything since spring.
Here is what a technician verifies in a fall heat pump visit.
- The reversing valve actually shifts and the system produces warm supply air on a call for heat.
- The defrost control initiates and terminates correctly, since a heat pump that cannot defrost will ice over.
- The auxiliary or emergency heat strips energize when they should, and only when they should.
- Refrigerant charge is correct, because heat pumps are less forgiving of charge errors than straight AC systems.
- The outdoor coil is clean and the unit has clearance on all sides.
- Drainage at the outdoor unit is clear, so defrost meltwater has somewhere to go.
- The thermostat is configured for the equipment it is actually controlling, which is a surprisingly common source of trouble.
That last one causes more heat pump complaints than any mechanical failure. A thermostat set up for a furnace, or a homeowner leaving the system on emergency heat all winter, produces high bills and lukewarm air with nothing actually broken.
Things heat pump owners notice and worry about
Two normal behaviors get reported to us as problems every fall.
The supply air feels cooler than a furnace. It is. A furnace pushes air in the 120 to 140 degree range in short bursts. A heat pump delivers steadier air at a lower temperature, often warm rather than hot. The house reaches and holds the same temperature, but standing at a vent feels different. That is design, not malfunction.
The outdoor unit runs longer and sometimes steams. Longer, gentler run cycles are how heat pumps are efficient. And when the unit goes into defrost, you may see vapor rising off the coil as frost melts. Both are expected.
Should you consider one when you replace?
If your air conditioner is nearing the end of its life and your furnace is a similar age, that is the natural moment to ask the question, because you are already replacing the outdoor unit. Replacing both halves separately, years apart, forecloses the option.
The honest answer depends on your ductwork, your electrical panel capacity, your current fuel costs, and how your home is insulated. Some Roseville homes are excellent candidates. Others are better served by a high-efficiency furnace paired with a new AC. A good contractor will tell you which one you are.
Our online replacement quote tool asks five quick questions and gives you a free, no-obligation estimate, and financing information is available on our site if the timing of a replacement is the hard part.
Get the heating half checked while it is still warm out
Ray O. Cook Heating and Air has served Roseville and the Greater Sacramento Area since 1947, and our technicians service heat pumps alongside furnaces and air conditioners. Heat pump service is on our regular menu, not an afterthought.
The best time to confirm your heating mode works is a mild week when you do not need it. Call us at (916) 237-9037 or schedule online, and we will run the system through heating, verify the defrost and auxiliary controls, and make sure the thermostat is telling it the right things before the first cold morning does the testing for you.
