Heat pump installation in Nashville starts with a room-by-room load calculation, because an oversized unit short cycles and leaves summer humidity in the house. The installer then matches the outdoor unit, indoor coil or air handler and thermostat, pressure tests and evacuates the lines, and sets the heat strips as backup only. Call (615) 412-2815 at any hour.
How we size and set up a new heat pump
A heat pump is a two-season machine, so sizing has to work for July humidity and January mornings at the same time. We run a load calculation from the house itself: square footage, windows, insulation, duct location and orientation. Then we check the ductwork, because a new heat pump on undersized or leaky ducts runs loud and short of capacity.
On the install we pressure test with nitrogen and pull a deep vacuum before releasing refrigerant. We wire the thermostat so the heat strips come on only when the heat pump truly needs help.
Replacing an electric furnace and AC with a heat pump
Plenty of all-electric homes heat with an electric furnace, which is a blower over a bank of resistance strips, paired with a central AC outside. Every winter hour on the strips costs far more than the same heat from a heat pump, which moves heat rather than making it.
The swap replaces the AC with a heat pump and either adds a matched coil to the existing air handler or replaces the air handler with one built for a heat pump. The old strips stay as backup heat. We also change the thermostat to one that understands heat pump staging.
Cold-climate heat pumps
A cold-climate heat pump uses a variable-speed inverter compressor that ramps up as the temperature drops. These models are rated to deliver much of their heating capacity well below freezing, where an older single-speed unit fades and hands the job to the strips.
They cost more up front and need careful line set work and a compatible thermostat or communicating control. For a house that sees hard cold snaps, or where the owner wants the strips to run as little as possible, it's often the right fit. We show the manufacturer capacity table at low temperatures so you can compare models on real numbers.
Single-stage, two-stage or variable-speed heat pump?
All three heat and cool the house. They differ in how steadily they run, how they handle humidity and how they hold up on the coldest mornings.
| Compare | Single-stage | Two-stage | Variable-speed |
|---|---|---|---|
| How it runs | Full output or off | Low stage most of the time, high when needed | Ramps in small steps to match the load |
| Summer humidity | Fair, short cycles remove less moisture | Better on long low-stage runs | Strongest, with long slow runs |
| Cold-morning output | Fades as it gets colder | Holds up somewhat longer | Holds the most capacity below freezing |
| Upfront cost | Lowest | Middle | Highest |
What a heat pump installation costs and what moves it
Equipment tier and the condition of the ducts and air handler move the number most.
For planning, HomeGuide puts typical national pricing for this kind of job at $3,800 to $8,200 (HomeGuide, August 2025). That is a market range, not our quote; the figure for your home comes after we see the equipment.
- System size. Tonnage comes from the load calculation, and each step up adds equipment cost.
- Single, two-stage or variable speed. Variable-speed inverter models cost the most and run the quietest and steadiest.
- Air handler or coil. Keeping a sound air handler with a new matched coil costs less than replacing both.
- Line set and pad. Reusing a line set saves money only when its size and condition suit the new unit.
- Ductwork condition. Undersized or leaky ducts may need repair before a new heat pump can deliver its rated output.
How Middle Tennessee homes heat, and the rebate to check
In EIA's 2020 survey a heat pump was the main heating equipment in about 35 percent of Tennessee homes, and a furnace in about 52 percent. So around Nashville a heat pump install is often a like-for-like swap, and just as often a change from a furnace and AC. TVA EnergyRight lists rebates of up to $800 for a heat pump, filed by an installer in the TVA program, and duct sealing and tune-ups also qualify. Check the current terms with TVA before you set an install date anywhere in Middle Tennessee.
What a heat pump installation includes
- Room-by-room load calculation
- Matched outdoor unit, coil or air handler
- New or flushed line set and outdoor pad
- Nitrogen pressure test and deep vacuum
- Heat pump thermostat with strip staging set
- Startup readings and a walkthrough of the controls
From load calculation to first heating cycle
- 1
Walk the house
We measure rooms, note windows and insulation, and look at the ducts and electrical panel.
- 2
Choose the system
You see two or three matched options with their cost and low-temperature capacity.
- 3
Install and evacuate
We set the equipment, braze and pressure test the lines, and pull a deep vacuum.
- 4
Commission and explain
We check charge, airflow and defrost, set strip staging, and show you the thermostat.
Brands we work on
We service and install equipment from the major manufacturers, including Carrier, Trane, Lennox, Rheem, Goodman, American Standard, Daikin, Mitsubishi Electric, Bryant, Ruud, York and Amana.
Heat pump installation questions we hear in Nashville
It comes from a load calculation on your house, not the square footage alone or the size of the old unit. Many older systems were oversized.
Sometimes. If it is in good shape and has a coil that matches the new heat pump, it can stay. An old air handler with a worn blower usually gets replaced with the system.
A correctly sized unit with backup strips will. Cold-climate models carry more of the load on their own and lean on the strips less.
TVA EnergyRight lists rebates of up to $800 for a heat pump, filed by an installer in the TVA program. Check the current terms before the install.
Yes. We install heat pump systems for homes, mobile homes and light commercial spaces such as small offices.