Heat pump or AC with heat strips: which fits a Jacksonville home?

How each one makes heat

An AC with heat strips is two separate systems in one box. The air conditioner cools. When you call for heat, electric resistance coils in the air handler glow and warm the air passing over them, much like a toaster. It's simple and reliable, and every unit of electricity becomes one unit of heat.

A heat pump runs the air conditioner in reverse. A reversing valve flips the refrigerant flow so the outdoor coil gathers heat from outside air and the indoor coil releases it. Moving heat takes less electricity than making it, so on a mild winter night a heat pump delivers two to three times as much heat per unit of electricity as strips.

Why the climate here favors a heat pump

Jacksonville sits in a cooling-dominant climate, with heating design temperatures around 27F to 32F. That's comfortably inside the operating range of a standard air-source heat pump. On the handful of nights that dip lower, a heat pump still has backup strips in the air handler to help.

Because the heat pump is also your air conditioner, the extra cost over an AC-only system is modest. You get one outdoor unit that cools for most of the year and heats efficiently for the rest.

Where an AC with strips still makes sense

In a small home or a rental where heat runs only a few days a year, the simpler system can be the right call. The up-front savings are real, and the extra running cost on those few cold nights may never add up to the difference.

It also makes sense when an existing air handler with strips is in good condition and only the outdoor AC has failed. Replacing the AC alone keeps the job smaller, though a matched heat pump system is usually the better long-term buy.

The backup strips on a heat pump

Heat pumps here still carry electric strips as backup. The trick is making sure they only run when needed. A thermostat set up for a heat pump uses a compressor lockout and staging so the strips don't kick on just because the house is a degree behind on a 45F morning.

If your power bill jumps every January, strips running when they shouldn't is one of the first things to check. It's often a thermostat setting rather than a failed heat pump.

Running costs in plain terms

Resistance strips turn every unit of electricity into one unit of heat. A heat pump on a typical Jacksonville winter night moves two to three units of heat for each unit of electricity it uses. On a cold morning the gap narrows and the backup strips help, but across a winter the heat pump usually costs noticeably less to run.

Because winters here are short, the dollar difference is smaller than in colder cities. That's why the choice depends on how many heating hours your home actually needs and how long you plan to stay.

Maintenance differences

A heat pump works year-round, so its outdoor unit runs more hours and has a few extra parts: the reversing valve, a defrost control and the defrost sensor. A tune up on a heat pump includes a heating check to catch those before the first cold night. An AC with strips has fewer moving parts on the heating side, but strips and sequencers still fail after sitting idle all summer.

What about gas?

Some older Jacksonville homes have a gas furnace. In that case a dual fuel setup, a heat pump with the gas furnace as backup, lets the system use the heat pump nearly all the time and gas only on the coldest mornings. It makes sense while the furnace still has life in it.

If the furnace is near the end too, replacing both with a heat pump and electric backup is usually simpler and avoids maintaining a gas appliance for a few cold days a year.