Brand guide · United States · checked October 19, 2026
Innovair, Stelpro, Dettson and Ouellet heat pumps
Innovair, Stelpro, Dettson and Ouellet is made by Innovair Solutions (L'Islet, Quebec), the former Ouellet Group, renamed in January 2023. ENERGY STAR lists 220 Innovair, Stelpro, Dettson and Ouellet outdoor models certified for the US, 209 of them cold-climate, and its best certified pairing heats at a COP of 2.80 at 5°F.
Certified for the US 220 outdoor models 574 certified pairings
Cold-climate 209 models meet ENERGY STAR Cold Climate
Best COP at 5°F 2.80 best HSPF2 14.8 · best SEER2 30.0
Warranty in the US 10-year parts, 10-year compressor register within 60 days
Innovair, Stelpro, Dettson and Ouellet at a glance
- Who owns it
- Innovair Solutions (L'Islet, Quebec), the former Ouellet Group, renamed in January 2023. It acquired Innovair Corporation in 2021, formed a strategic alliance with Groupe Stelpro in May 2024 (Stelpro now calls itself one of Innovair Solutions' brands; terms weren't published), and also owns Dettson and Ouellet.
- Sister brands
- Innovair, Stelpro, Dettson, Ouellet, Warmzone, Thermo 2000
- Headquarters
- L'Islet, Quebec, Canada
- How it's sold
- Contractor-installed
- Price tier
- Mid-range. None of the four brands publishes equipment prices; installers quote them. Ouellet publishes prices for its optional labour warranties only (C$249 to C$1,260). Tier is an estimate.
- What it makes
- air-to-water, ducted central, ducted mini-split, ductless mini-split, multi-zone
- Names on ENERGY STAR's list
- ACD, Capella, Dettson, Innovair, Ouellet, Stelpro (certified by ACD Group Inc; Dettson Industries Inc.; Innovair Corporation)
Product lines
The current residential heat pump lines we found on Innovair, Stelpro, Dettson and Ouellet's own pages, with the low-temperature claim in the maker's words. 7 of 15 are sold as cold-climate.
| Line | Type | Cold-climate | Maker's low-temperature claim | Refrigerant |
|---|---|---|---|---|
| Innovair: M4 / M4+ Series (single- and multi-zone) | ductless mini-split | Yes | US: "Low ambient operation to -13°F"; Canada (Dettson): "performance fiable jusqu'à -30°C" (reliable performance down to -30°C) | R-454B |
| Innovair: Q Series (Q4, Q4+, Q32, Q32 Pro) | ductless mini-split | Yes | No low-temperature figure published | — |
| Innovair: Slim4 / Slim4+ central (air handler, cased coil, wall mount) | ducted central | Yes | Canada (Dettson): "offre une chaleur continue jusqu'à -30°C" (continuous heat down to -30°C) | R-454B |
| Innovair: Slim24 Hyper Heat (central, concealed duct, wall mount) | ducted central | Yes | "The Hyper Heat model operates efficiently down to -22°F, and the regular heat pump functions at -4°F" | — |
| Stelpro: Elite B (SELB) single-zone | ductless mini-split | Yes | Heating operating ambient -25°C to 24°C (-13°F to 75°F); heating COP 1.22-1.55 at -25°C depending on size; listed ENERGY STAR Cold Climate | R-454B |
| Stelpro: Pro B (SEPB) single-zone | ductless mini-split | No | Heating operating ambient "-30 to 24 (-22 to 75)" °C (°F) | R-454B |
| Stelpro: Multi B (SMZ) multizone, up to 6 indoor units | multi-zone | No | Heating operating ambient "-30 to 24 (-22 to 75)" °C (°F) | R-454B |
| Stelpro: Slim B central system (SAHB/SACB/SDB) | ducted central | No | Heating operating ambient "-30 to 24 (-22 to 75)" °C (°F); cased-coil combinations list 21,000-42,000 BTU/h maximum output at -15 °C (5 °F) | R-454B |
| Dettson: Innovair M4+ single-zone (sold by Dettson) | ductless mini-split | Yes | "défie les hivers canadiens avec une performance fiable jusqu'à -30°C" (reliable performance down to -30°C) | R-454B |
| Dettson: Innovair Slim4+ central, 2-5 tons (sold by Dettson) | ducted central | Yes | "offre une chaleur continue jusqu'à -30°C" (continuous heat down to -30°C) | R-454B |
| Ouellet: OTP-H R32 Harmony single-zone (9k-36k BTU) | ductless mini-split | No | No low-temperature figure published | R-32 |
| Ouellet: OTP-O R32 Olympia single-zone | ductless mini-split | No | No low-temperature figure published | R-32 |
| Ouellet: OTP-P R32 Pacific single-zone | ductless mini-split | No | No low-temperature figure published | R-32 |
| Ouellet: OTP-MZ R32 Myriad Plus multizone | multi-zone | No | No low-temperature figure published | R-32 |
| Ouellet: OTP-F R32 Flexx central | ducted central | No | No low-temperature figure published | R-32 |
Certified models with the best cold-weather numbers
From ENERGY STAR's list for the US (updated October 19, 2026): each row is one outdoor unit with its best certified pairing. 171 of 220 Innovair, Stelpro, Dettson and Ouellet outdoor models use R-454B or R-32; the tables show those.
Mini-splits and multi-splits (159 models)
| Outdoor / indoor model | Size | Heat at 5°F | COP at 5°F | HSPF2 | SEER2 | Refrigerant | AHRI # |
|---|---|---|---|---|---|---|---|
| MOM27H2XE3A MOM Series | 27,000 BTU/h 2.5-ton | 21,400 BTU/h 79% of rated | 2.80 | 10.0 | 22.5 | R-32 ENERGY STAR Cold Climate | 218731841 |
| MOS24H2BM0A MHW24H2BHRB MHW Series | 25,000 BTU/h 2-ton | 19,600 BTU/h 78% of rated | 2.54 | 11.7 | 23.0 | R-454B ENERGY STAR Cold Climate | 215725441 |
| QOS18H2XE5A QHW18H2UZRA Q32 | 18,000 BTU/h 1.5-ton | 13,700 BTU/h 76% of rated | 2.50 | 9.8 | 21.0 | R-32 | 215493755 |
| MOS12H2BM0A MCW12H2BHRA MOS Series | 12,000 BTU/h 1-ton | 8,900 BTU/h 74% of rated | 2.50 | 11.0 | 24.6 | R-454B ENERGY STAR Cold Climate | 217230004 |
| MOS18H2BM0A MDH18H2MHWA MDH Series | 20,000 BTU/h 1.5-ton | 14,200 BTU/h 71% of rated | 2.40 | 11.3 | 20.0 | R-454B ENERGY STAR Cold Climate | 215725462 |
| MOS06H2BH0A MHW06H2BHRB MHW Series | 7,000 BTU/h 0.5-ton | 7,700 BTU/h 110% of rated | 2.39 | 14.8 | 25.5 | R-454B ENERGY STAR Cold Climate | 215725442 |
Central (ducted) split systems (66 models)
| Outdoor / indoor model | Size | Heat at 5°F | COP at 5°F | HSPF2 | SEER2 | Refrigerant | AHRI # |
|---|---|---|---|---|---|---|---|
| TOV60H2XA TAV60X2A T32 | 55,000 BTU/h 4.5-ton | 40,000 BTU/h 73% of rated | 2.30 | 8.8 | 18.0 | R-32 ENERGY STAR Cold Climate | 217496787 |
| MOS18H2BM0A MAH18H2MHWA MOS Series | 18,000 BTU/h 1.5-ton | 13,000 BTU/h 72% of rated | 2.30 | 9.8 | 18.5 | R-454B ENERGY STAR Cold Climate | 217754317 |
| MOS18H2BH0A MAH18H2MHWA MOS Series | 19,500 BTU/h 1.5-ton | 18,000 BTU/h 92% of rated | 2.20 | 10.0 | 18.0 | R-454B ENERGY STAR Cold Climate | 218679845 |
| MOS24H2BM0A MAH24H2MHWA MOS Series | 25,000 BTU/h 2-ton | 18,000 BTU/h 72% of rated | 2.20 | 9.0 | 19.7 | R-454B ENERGY STAR Cold Climate | 217754318 |
| MOS24H2BH0A MAH24H2MHWA MOS Series | 26,000 BTU/h 2-ton | 23,600 BTU/h 91% of rated | 2.16 | 10.0 | 18.7 | R-454B ENERGY STAR Cold Climate | 218679846 |
| TOV36H2XA TAV24X2A T32 | 24,000 BTU/h 2-ton | 19,000 BTU/h 79% of rated | 2.15 | 9.5 | 19.0 | R-32 ENERGY STAR Cold Climate | 217496784 |
Most efficient for cooling
| Outdoor / indoor model | Size | SEER2 | EER2 | HSPF2 | COP at 5°F | Refrigerant | AHRI # |
|---|---|---|---|---|---|---|---|
| OARX-H09A-O OARX-H09A-I Olympia | 10,600 BTU/h 1-ton | 30.0 | 16.8 | 11.2 | 2.11 | R-32 ENERGY STAR Cold Climate | 216472855 |
| OARX-H12A-O OARX-H12A-I Olympia | 12,200 BTU/h 1-ton | 29.5 | 15.2 | 10.0 | 2.00 | R-32 ENERGY STAR Cold Climate | 216472856 |
| OARX-H18A-O OARX-H18A-I Olympia | 18,600 BTU/h 1.5-ton | 27.5 | 14.3 | 10.0 | 1.80 | R-32 ENERGY STAR Cold Climate | 216498641 |
| CPPB-H09A-O CPPB-H09A-I CPPB Series | 12,000 BTU/h 1-ton | 27.4 | 15.4 | 12.5 | 1.80 | R-454B ENERGY STAR Cold Climate | 216027620 |
Look up any pairing by its AHRI number in the AHRI Directory ↗ or search the model in ENERGY STAR's product finder ↗. Ratings are for the exact indoor and outdoor pairing shown.
Warranty
Innovair 10-year parts, 10-year compressor
Registration: The 2026 M-Series card says residential coverage applies only if the unit is registered within 60 days of installation (or of buying a new home). Innovair's document centre separately says policies since Jan 1, 2025 'include extended terms without registration'. Confirm with Innovair.
Labour: Not covered (labour, shipping and materials excluded); a licensed HVAC contractor must install and maintain the unit
Stelpro 10-year parts, 10-year compressor
Labour: Not included ('labor not included', US product page)
Strengths and watch-outs
Strengths
- Every current line from the four brands carries a 10-year parts and 10-year compressor base warranty (each brand's 2026 warranty documents)
- Stelpro Elite B is listed ENERGY STAR Cold Climate, with heating COPs published down to -25°C (Stelpro)
- Quebec-based group with Canadian support, and Dettson pairs its heat pumps with its own furnaces for hybrid systems
- Innovair M4+ and Slim4+ are sold in Canada through Dettson with claimed performance down to -30°C (Dettson)
Watch-outs
- Registration rules differ by brand: Stelpro and Ouellet require registration within 30 days outside Quebec or there is no warranty; Innovair's US card says 60 days; Dettson says registration isn't required
- Ouellet must be installed by a certified Ouellet installer, and its R32 pages publish no low-temperature ratings
- Dettson doesn't sell its own-design heat pumps in 2026: its line-up is Innovair and Gree units
- Labour isn't covered by any of the four base warranties; Stelpro and Ouellet sell optional labour plans that must be bought within 30 days
Which rebates Innovair, Stelpro, Dettson and Ouellet models fit
Every model in these tables is ENERGY STAR certified, which is the federal equipment rule for the Home Electrification and Appliance Rebates where your state runs them. 209 Innovair, Stelpro, Dettson and Ouellet outdoor models also meet ENERGY STAR Cold Climate, which several utility programs require. The 25C tax credit ended for heat pumps placed in service after December 31, 2025.
Rebate rules by metro:
Recent news
- Ouellet's 2026 warranty documents add Quebec's new 6-year legal warranty of good functioning for heat pumps bought from Oct 5, 2026 ouellet.com ↗
- INNOVA (the Italian no-outdoor-unit heat pump brand) says its naming dispute with Innovair is resolved; it traded as Ephoca in the US from 2021 and has returned to the INNOVA name innova.co ↗
- Parent Innovair Solutions acquires Thermo 2000; Dettson's site now lists Thermo2000 documents next to its heat pumps mechanicalbusiness.com ↗
- Innovair Solutions acquires Thermo 2000 (hydronic heating and hot water; Richmond, QC) mechanicalbusiness.com ↗
- Parent Innovair Solutions acquires Thermo 2000 mechanicalbusiness.com ↗
- Innovair Solutions acquires Warmzone (Salt Lake City radiant heating) as part of the alliance's growth plan mechanicalbusiness.com ↗
- Parent Innovair Solutions forms a strategic alliance with Groupe Stelpro mechanicalbusiness.com ↗
- Groupe Stelpro and Innovair Solutions form a strategic alliance (15 brands combined) mechanicalbusiness.com ↗
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Sources
Model counts and ratings: ENERGY STAR Certified Heat Pumps, updated October 19, 2026. Brand facts checked October 19, 2026 on:
- Innovair (US) home
- Innovair ductless systems (M4, Q Series)
- Innovair residential products
- Innovair Slim series
- Innovair about (acquired by Innovair Solutions in 2021)
- Innovair document centre (warranty cards)
- Innovair 2026 M-Series warranty card (PDF)
- Dettson heat pumps (Innovair lines in Canada)
- Dettson Innovair M4+
- Dettson Innovair warranty (Canada, PDF)
- Innovair Solutions - Nos marques
- Innovair Solutions - À propos
- Stelpro heat pumps (Canada)
- Stelpro Elite B (SELB)
- Stelpro Multi B (SMZ)
- Stelpro Slim B central system
- Stelpro USA Pro B (SEPB)
- Stelpro USA home (Heat Pumps and HVAC category)
- Stelpro heat pump limited warranty (INS_GARANTIE_LIMITEE_THERMOPOMPE_0425)
- Stelpro heat pump warranties page
- Stelpro - Who we are (Innovair Solutions brand)
- Mechanical Business: Innovair Solutions and Stelpro team up (May 2024)
- Electrical Industry News: behind the Stelpro-Innovair alliance (Jul 2024)
- Dettson Innovair Slim4+