Top-Rated Heat Pump Installers in Ontario, CA

10 local companies ranked by 10,767 Google reviews. Free to compare, no sign-up.

Ratings collected September 2026 · Page updated September 30, 2026

10Companies
10,767Google reviews
4.8★Average rating
Sep 2026Data collected
Ranked by Google reviewsNever paid forFree to compare

Short answer: The top-rated heat pump installers in Ontario are Diamond Air Services (5.0★, 426 reviews), Monkey Wrench Plumbing, Heating, Air & Electric (5.0★, 130 reviews), All Pro Cooling, Heating, Plumbing & Electrical (4.8★, 8,974 reviews).

Heat Pump installers in Ontario, ranked 10 listed

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  1. 1
    Diamond Air ServicesTop pickHighest rating (50+ reviews)
    5.0 (426 Google reviews)
    1630 E Francis St Ste c, Ontario, CA 91761
    Call (909) 713-6644WebsiteGoogle reviewsProfileDirections
  2. 2
    Monkey Wrench Plumbing, Heating, Air & ElectricTop pick
    5.0 (130 Google reviews)
    3200 E Guasti Rd Ste 100-G, Ontario, CA 91761
    Call (909) 791-2726WebsiteGoogle reviewsDirections
  3. 3
    All Pro Cooling, Heating, Plumbing & ElectricalTop pickMost reviews
    4.8 (8,974 Google reviews)
    2311 E Locust St, Ontario, CA 91761
    Call (909) 375-1244WebsiteGoogle reviewsDirections
  4. 4
    Macawsome Heating & Cooling
    4.8 (187 Google reviews)
    4375 E Lowell St Ste n, Ontario, CA 91761
    Call (909) 333-4004WebsiteGoogle reviewsDirectionsEmail [email protected]
  5. 5
    Magnison and Moen Inc
    4.9 (47 Google reviews)
    1701 S Vineyard Ave H, Ontario, CA 91761
    Call (909) 947-3187WebsiteGoogle reviewsProfileDirections
  6. 6
    Ontario Air Conditioning & Heating
    5.0 (20 Google reviews)
    11193 Central Ave, Ontario, CA 91762
    Call (909) 318-0812Google reviewsDirections
  7. 7
    NexGen HVAC & Plumbing
    4.7 (603 Google reviews)
    1428 S Grove Ave Unit B, Ontario, CA 91761
    Call (909) 487-5060WebsiteGoogle reviewsDirections
  8. 8
    Northstar Plumbing, Heating and Air Conditioning
    4.7 (338 Google reviews)
    1351 S Grove Ave #110, Ontario, CA 91761
    Call (909) 593-3353WebsiteGoogle reviewsDirectionsEmail [email protected]
  9. 9
    Brook's Heating and Air
    5.0 (10 Google reviews)
    337 N Vineyard Ave #337, Ontario, CA 91764
    Call (909) 312-7161Google reviewsProfileDirections
  10. 10
    Ontario Heating & Air Conditioning
    4.6 (32 Google reviews)
    125 E California St, Ontario, CA 91761
    Call (909) 347-7266Google reviewsDirections

Together these 10 companies average 4.8★ across 10,767 reviews. All Pro Cooling, Heating, Plumbing & Electrical has the most reviews (8,974).

Ranked by Google rating weighted by review count, collected September 2026. Rankings are never paid for. How we rank and how we make money.

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What a heat pump costs in Ontario

Typical installed priceabout $17,500 to $20,700

For a typical 3-ton system ($5,830 per ton for ductless up to $6,914 per ton for ducted). Your home may cost more or less.

Heat pump rebates open in Ontarioup to $3,100

That could cut your cost by up to $3,100 if you qualify. Most rebates have rules (income, your current heating, a registered contractor, approval before work starts).

Price source: Massachusetts Residential Heat Pump Invoice Cost Study, based on real Mass Save and MassCEC invoices (January 2024 dollars). Rebates: our verified program data, checked monthly. Always confirm the exact amount for your home.

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What Ontario's winter means for your heat pump

In Ontario, the average January low is 7°C (45°F), and the coldest temperature recorded from 2015-2024 was -1°C (30°F). That's milder than 93% of the 123 cities we track. Winters here are mild enough that most cold-climate heat pumps can heat your whole home. Sizing and installation quality matter more than squeezing out extra cold-weather rating.

Source: Open-Meteo historical weather data, 2015-2024.

Before you hire a heat pump installer

  1. Ask for a room-by-room heat loss calculation. A quote that guesses the size from square footage alone is a red flag.
  2. Ask for the exact model and its heating output at your area's coldest temperature, not just the brand.
  3. Ask who handles the rebate paperwork and whether the model is on your rebate program's eligible list.

Before you call anyone, check what heat pump rebates you can get in Ontario. Many programs require approval or a registered contractor before work starts.

See every rebate in Ontario

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