WaterFurnace (NIBE)
Standard warranty: all parts 10 years with a 5-year labor allowance (7 Series); optional 10-year parts and 10-year labor allowance, depending on the dealer
Heat pump types · checked October 19, 2026
Geothermal, window and no-outdoor-unit heat pumps
Most homes get an air-source heat pump. These are the other options: ground-source systems that hold their output in any weather, and small units for apartments and rooms where an outdoor unit isn't possible.
Geothermal (ground-source) heat pump makers
A ground loop keeps the heat pump's source near 5–10°C all winter, so capacity doesn't fall in a cold snap. The loop (drilled or trenched) is most of the cost, and its design decides how well the system works. Geothermal units aren't in ENERGY STAR's air-source list, so this section uses the makers' own pages.
ClimateMaster (NIBE, via Climate Control Group)
"Standard 10-year limited warranty on all parts"; 5-year labor allowance; optional warranty extends the labor allowance to 10 years (US and Canada; not transferable)
GeoComfort / Enertech (Enertech Global, LLC)
10-year warranty on all unit components; 5-year labor allowance credit (transferable); optional 'Peace of Mind' one-time compressor and air-coil replacement up to 18 years after installation
Nordic (Maritime Geothermal Ltd.)
10-year limited warranty on the compressor and major refrigerant-circuit components, 5 years on other components; 5-year labour allowance on major parts; start-up record due within 90 days
Bosch (Bosch Home Comfort, including FHP water-source)
Warranty terms not published on the pages we could read.
Comfort-Aire / Century geothermal (Heat Controller)
Warranty terms not published on the pages we could read.
Why people choose it
- Heating capacity doesn't drop with outdoor air temperature, so ground-source suits the coldest regions
- Highest efficiencies of any heat pumps (WaterFurnace 7 Series up to 47.0 EER / 5.2 COP; ClimateMaster Trilogy 45 QE 45.1 EER part-load)
- Most makers include 10-year parts coverage plus labor allowances
- Some units also make domestic hot water (e.g., ClimateMaster Q-Mode)
Watch-outs
- 'Labor allowances' follow capped schedules and may not cover the full labour bill
- Coverage depends on dealer paperwork (e.g., Nordic start-up record within 90 days; WaterFurnace warranty options depend on the dealer)
- Needs a ground loop and a specialist dealer, and loop quality largely determines performance
- ClimateMaster's standard residential warranty isn't transferable to a new owner
None of these makers publish prices; installed cost is quoted by dealers and depends mostly on the ground loop (drilling or trenching).
Rebates that cover ground-source systems
| Metro | Program | Status | Ground-source terms |
|---|---|---|---|
| New York City | NYS Clean Heat: Con Edison geothermal heat pump incentive | Open | Whole-building retrofit: $30,000 weatherized / $25,000 standard, or $40,000 / $35,000 in a DAC. New construction: $15,000, or $20,000 in a DAC. Capped at 70% of project cost (85% in a DAC). The detail page headline says 'up to $40,000', while Con Edison's overview page still says 'up to $35,000'. |
| New York City | NYSERDA EmPower+ with Sustainable Futures heat pump add-on | Open | Sustainable Futures Program add-ons, on top of EmPower+ caps: air-source heat pump $10,000; ground-source heat pump $10,000. EmPower+ caps: low income, no-cost up to $14,000 downstate ($12,000 upstate); moderate income, 50% up to $7,000 downstate ($6,000 upstate). The HEAR add-on covers only air… |
| New York City | PSEG Long Island whole-house cold-climate heat pump rebate | Open | Whole-house cold-climate ASHP or air-to-water, single-family (1-4 units): low income (<60% AMI) $7,500; moderate income (<80% AMI) $5,000; market rate in a Disadvantaged Community $5,000; market rate $4,000. Contractors also get a $250 incentive per project. Multifamily ground-source: $3,000 per… |
| Chicago | ComEd heat pump instant discounts (ducted air-source, ductless mini-split, geothermal) | Unconfirmed | Not re-confirmed on October 19, 2026: ComEd's pages didn't load. Our October 12 check: ducted air-source Tier 1 up to $900 (up to $1,400 at 2.5 tons or more); Tier 2 up to $1,500 (up to $2,000 at 2.5 tons or more); ductless mini-split up to $500 (up to $1,000 at 1.5 tons or more); $75 for an ENERGY… |
| Atlanta | Georgia Power Home Energy Improvement Program (HEIP): heat pump conversion rebates | Open | Source: HEIP 2026 Precondition and Improvement Requirements PDF ('Rebates effective August 1, 2026'; valid Aug. 1, 2026-Dec. 31, 2028). Furnace conversion to air-source heat pump: 50% of cost, up to $1,500. Conversion to ground-source heat pump: 50% of cost, up to $300. All HEIP rebates are capped… |
| Detroit | DTE Energy heat pump replacement rebates | Open · limits apply | Cold-climate ASHP: $1,200 (16+ SEER2, 9.1+ HSPF2, EER2 ≥ 10.0); $1,000 (16+ SEER2, 8.4+ HSPF2, EER2 ≥ 10.0); $900 (15.2-15.99 SEER2, 8.4+ HSPF2, EER2 ≥ 10.0). Ground source: $800 (20+ EER2); $600 (17-19.99 EER2). Ductless mini-split: $1,000 (over 31.5 SEER2 and HSPF2 10); $700 (17-31.5 SEER2 and… |
| Detroit | Consumers Energy heat pump rebates (Home Solutions) | Open | Air-source heat pump $300. Ground-source $200 (EER 17-18.99) or $300 (EER 19 or higher). Ductless mini-split $350. |
| Minneapolis–St. Paul | Xcel Energy Minnesota heat pump rebates | Unconfirmed | Confirmed on October 19 on CEE's Minneapolis Bonus Rebate page: ducted ASHP $500 and ducted cold-climate ASHP $900 for Xcel electric-only customers; mini-split $1,600; cold-climate mini-split $2,000. Not re-checked on October 19 (our October 12 check, Xcel form 26-04-601): combination or gas-only… |
| Tampa | Tampa Electric Heating & Cooling rebate | Open | Per condensing unit: $40 at SEER 16.00 / SEER2 15.20 (geothermal 14.00 EER or more); $550 at SEER 17.00 / SEER2 16.20 (geothermal 15.00 EER or more). If the system costs less than the rebate, the rebate is matched to the invoice price. |
| Denver | Xcel Energy Colorado heat pump rebates | Unconfirmed | Not re-confirmed on October 19, 2026: Xcel's rebate summary isn't readable online, and co.my.xcelenergy.com pages didn't load. Our October 12 check (Rebate Summary effective Oct. 1, 2026), standard rebate [with bonus]: ducted or mixed-ducted ASHP $300 per cooling ton [$600]; ducted cold-climate… |
| Denver | Colorado Heat Pump Tax Credit (contractor-delivered discount) | Open | For installs on or after Jan. 1, 2026: air-source $1,000 credit, with at least $333 passed to the customer as a discount; ground-, water- or combined-source $2,000, with at least $667; heat pump water heater $250, with at least $83. The 2024-2025 amounts are marked 'Expired'. |
| Baltimore | BGE high-efficiency heat pump rebates (EmPOWER Maryland) | Open | The page lists no dollar amounts: 'Check with a participating HVAC contractor', and 'you'll see the rebates reflected in the contract price.' It mentions 'additional incentives for switching from natural gas, oil or propane to electric' without an amount. It also cites Maryland Energy… |
| St. Louis | Ameren Missouri PAYS heating and cooling rebates | Closed now | Rebate sheet valid Jan. 1-Dec. 31, 2026, for PAYS tier 4 participants only. Air-source heat pump replacing an ASHP, replacing electric resistance, or where there is no existing central system: $2,000 per system. Dual-fuel ASHP: $2,000. Ground-source: $5,000. Mini-split A/C or heat pump: $500 per… |
The federal 25D credit, which covered geothermal heat pumps, ended for expenditures made after December 31, 2025.
Window and saddle heat pumps
Sold in the US: Gradient (to building owners), Midea (through distributors), Friedrich Kühl+, Comfort-Aire RAH.
Gradient All-Weather 120V (Gradient)
"Operates -13 °F to 115 °F"; 7,026 BTU/hr heating at -13°F (-25°C)
Midea window heat pump, PWHP (Midea)
No low-temperature figure published.
Friedrich Kühl+ heat pump window units (Friedrich, a Rheem company)
Kühl+ units "heat effectively down to 45 degrees" (unit not stated, presumably °F); 230-volt models add backup electric heat
Comfort-Aire RAH-123 / RAH-183, 230V (Heat Controller)
No low-temperature figure published.
Where they make sense
- Plug-in 120V option (Gradient) with no refrigerant work and about a 30-minute install
- Cold-climate models (Gradient, Midea) keep heating well below 0°F
- Works for renters and apartments where mini-split outdoor units aren't allowed
Watch-outs
- Most need up-and-down (sash) windows; Gradient needs at least 26 in of width and weighs 140 lb
- Conventional window heat pumps (e.g., Friedrich Kühl+) stop heating efficiently around 45 degrees and fall back to electric resistance heat
- Limited availability in 2026: Gradient sells only to building owners, Midea's unit goes through distributors and installers, and Canadian availability is minimal
- Small capacities (about 7,000-14,000 BTU/h heating), so plan one unit per room
- Not sold to individual consumers ('Gradient doesn't sell directly to consumers', WBUR Feb 2026); only building owners can buy
Midea PWHP: US$2,800-3,000 through Midea distributors (Fast Company, Dec 2025). Gradient: no public price; the Boston pilot costs about US$5,400 per apartment including installation and a smart thermostat (WBUR, Feb 2026). Friedrich and Comfort-Aire don't publish prices on their sites.
Heat pumps with no outdoor unit
Wall-mounted units that breathe through two holes in the exterior wall, for heritage buildings, condos and rooms where an outdoor unit isn't allowed. They are less efficient in deep cold than a split system.
The main maker certified for the US is Innova (sold in the US as Ephoca until 2026). See Innova's certified models and warranty.
Air-to-water heat pumps
For homes with radiators or in-floor heating. Makers with lines in North America include Mitsubishi Electric (ecodan, launched in the US in 2026), Daikin (Altherma 3 H HT, US 2026), Samsung (EHS) and Carrier. They aren't on ENERGY STAR's air-source list; ask installers for the maker's performance data at your design temperature.
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