Types of Heat Pumps
The main residential heat-pump choices are air-source, ducted, ductless mini-split, cold-climate, geothermal, and dual-fuel systems. They all move heat rather than creating it directly, but they differ in where they collect heat, how they distribute it through the house, how they perform in cold weather, and what they cost to install.
The right type depends less on which technology sounds most advanced and more on your existing HVAC system, climate, ductwork, electrical service, comfort goals, and installation budget.
The U.S. Department of Energy describes air-source and geothermal systems as the two main duct-connected heat-pump categories, with ductless mini-splits and other configurations serving homes where conventional ducts are absent or undesirable.
Source: DOE - Pump Up Your Savings with Heat Pumps
Heat Pump Types Compared
| Type | Heat source | Distribution | Best fit | Main tradeoff |
|---|---|---|---|---|
| Air-source | Outdoor air | Ducted or ductless | Most U.S. homes | Performance varies by equipment and outdoor temperature |
| Ducted | Outdoor air | Existing or new ducts | Central HVAC replacements | Depends heavily on duct quality |
| Ductless mini-split | Outdoor air | Individual indoor units | Homes without ducts, additions, zoning | Multiple indoor units may be needed |
| Cold-climate | Outdoor air | Ducted or ductless | Regions with regular freezing weather | Equipment selection requires low-temperature data |
| Geothermal | Ground or groundwater | Usually hydronic or ducted | Long-term owners, new builds, major renovations | High upfront installation complexity |
| Dual fuel | Outdoor air + furnace fuel | Usually ducts | Homes keeping a gas or oil furnace | More equipment and control complexity |
What Is an Air-Source Heat Pump?
An air-source heat pump transfers heat between the home and the outdoor air.
In cooling mode, it moves indoor heat outside. In heating mode, it reverses the refrigeration cycle and extracts usable heat from outdoor air.
Air-source systems are the most common residential heat pumps in the United States and can be configured as either central ducted systems or ductless mini-splits.
Modern air-source heat pumps are not limited to mild climates. ENERGY STAR now maintains a separate Cold Climate designation for systems that meet defined low-temperature efficiency and capacity requirements.
What Is a Ducted Heat Pump?
A ducted heat pump uses a central air handler and a network of supply and return ducts to heat and cool the home.
This is usually the cleanest heat-pump replacement path for a house that already has central air conditioning or forced-air heating, assuming the ductwork is properly sized and in good condition.
Ducted systems can use single-stage, multi-stage, or variable-speed compressors. Inverter-driven equipment can adjust capacity over a wider range rather than switching between only full output and off.
The ductwork matters as much as the equipment. Leaky, undersized, or restrictive ducts can erase a meaningful portion of the comfort and efficiency benefit from a new system.
What Is a Ductless Mini-Split Heat Pump?
A ductless mini-split heat pump connects one outdoor unit to one or more indoor units without conventional whole-house ductwork.
DOE identifies ductless systems as particularly useful for homes with non-ducted heating, room additions, and zones where adding or extending ducts is impractical.
Ductless systems can also solve a different problem from central HVAC: they allow individual rooms or zones to be conditioned independently.
That flexibility can be excellent in the right house and unnecessarily complicated in the wrong one.
Ductless mini-split heat pumps
What Is a Cold-Climate Heat Pump?
A cold-climate heat pump is an air-source heat pump that has demonstrated stronger low-temperature heating performance than a standard qualifying system.
Under the current ENERGY STAR specification, a residential cold-climate heat pump must meet both seasonal-efficiency requirements and specific low-ambient tests.
For a ducted split system, ENERGY STAR currently requires at least:
| Metric | Cold-climate requirement |
|---|---|
| SEER2 | 15.2 or higher |
| HSPF2 | 8.1 or higher |
| COP at 5°F | 1.75 or higher |
| Heating capacity at 5°F | At least 70% of capacity at 47°F |
Non-ducted cold-climate split systems have a higher HSPF2 threshold of 8.5.
Source: ENERGY STAR Heat Pump Key Product Criteria
The label matters because "works in cold weather" is too vague to be useful. A northern homeowner should compare the selected system's actual heating capacity at local winter design temperature.
What Is a Geothermal Heat Pump?
A geothermal heat pump, also called a ground-source heat pump, exchanges heat with the ground or groundwater rather than directly with outdoor air.
DOE notes that underground temperatures are comparatively stable year-round, allowing geothermal systems to use the earth as a heat source in winter and a heat sink in summer.
This can produce excellent heating and cooling efficiency, but the ground loop makes the installation fundamentally different from replacing a conventional outdoor condenser.
The economics tend to make the most sense when the property, project scope, and ownership horizon justify the higher upfront work.
What Is a Dual-Fuel Heat Pump?
A dual-fuel heat pump combines an electric air-source heat pump with a gas or oil furnace.
The heat pump handles heating when conditions and operating economics favor it. The system can switch to the furnace when the control strategy calls for fossil-fuel heat.
ENERGY STAR describes dual fuel as a way to use a heat pump and traditional furnace flexibly based on costs and other operating considerations.
Source: ENERGY STAR Air-Source Heat Pumps
Dual fuel can be attractive for homeowners who want a heat pump but do not want to remove an existing furnace, especially when that furnace still has useful service life.
Which Type of Heat Pump Is Best for an Existing Home?
For most existing homes, start with the infrastructure already in place.
If you already have good central ductwork
Quote a ducted air-source heat pump first.
It usually requires the least disruption because the heat pump can use the distribution system the house already has.
If you have no ducts
Start with ductless mini-splits unless a major renovation already justifies adding ductwork.
DOE specifically identifies mini-splits as a strong retrofit option for homes using hydronic, radiant, or other non-ducted heating.
If you live in a cold climate
Do not simply ask for "a heat pump."
Ask for a system whose low-temperature output has been matched against the house's heating load.
An ENERGY STAR Cold Climate designation is a useful first screen, but the selected model still needs to fit the actual design conditions.
If you are building or doing a major renovation
Price geothermal alongside high-performance air-source systems if the site can accommodate the ground loop and the long-term economics make sense.
If you have a serviceable furnace you want to keep
A dual-fuel configuration can add heat-pump heating and cooling while retaining the furnace as the second heat source.
Which Heat Pump Type Is Cheapest to Install?
A simple single-zone ductless system can have the lowest entry cost because it serves a limited area and does not require whole-home ductwork.
For whole-home projects, the lowest installed cost depends heavily on what the house already has.
A central ducted heat pump can be cost-effective when usable ducts are already present. The same project becomes substantially more expensive if the ducts need major redesign, the electrical service needs work, or the home requires multiple zones.
Geothermal typically has the highest upfront complexity because the project includes the ground loop.
Compare installed prices by system type.
Which Type Is Most Efficient?
There is no useful universal answer without defining the operating conditions.
Geothermal systems benefit from relatively stable ground temperatures and can achieve very high efficiency. Advanced air-source inverter systems can also perform extremely well, especially when correctly sized and operated through long part-load periods.
For air-source equipment, compare SEER2, HSPF2, and low-temperature COP/capacity rather than treating one efficiency number as the entire answer.
For geothermal equipment, ENERGY STAR uses EER and COP criteria that vary by open-loop, closed-loop, water-to-air, and water-to-water configuration.
Source: ENERGY STAR Geothermal Heat Pump Criteria
How Do You Choose the Right Type?
Use this order:
- Calculate the home's heating and cooling loads.
- Identify whether existing ductwork is worth keeping.
- Establish winter and summer design conditions.
- Decide whether whole-home zoning matters.
- Check electrical capacity.
- Compare equipment performance at the temperatures that matter locally.
- Check current rebates.
- Compare complete installed quotes.
Do not choose the technology first and force the house to fit it afterward.
Compare the best heat pumps and review heat-pump installation before requesting quotes.
Compare Heat Pump Options for Your Home
Get local installation quotes and compare system types against the same home load and project scope.
Prepare for installer conversations
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