Cosgriff Climate Control
- Website checked
Design Heating, LLC
Design Heating is an HVAC contractor in Duluth, Minnesota, doing furnace, boiler, heat pump, ductless mini-split, air conditioning and heating repair work for Duluth and nearby towns.
What they do
Design Heating installs and repairs furnaces, boilers, heat pumps, ductless mini-splits and air conditioning in and around Duluth, Minnesota. Each system is sized with a Manual J heat-loss calculation before equipment is chosen, and the company works with brands including Mitsubishi, Fujitsu, Viessmann and Navien. Cold-climate mini-split heat pumps and high-efficiency condensing boilers are among the installs it lists. Free estimates are offered and financing is available. Work extends to Hermantown, Cloquet and Two Harbors, and urgent heating requests are prioritized for same-week appointments where possible.
- Furnace repairs and installs
- Boiler service
- Heat pumps
- Ductless mini-splits
- Air conditioning
- Heating repairs
Listed under Heating and cooling emergencies
Where they work
What we checked
- Its own website lists this work: designheating.net/services/boilers (opens in a new tab), designheating.net/services/furnaces-and-ac (opens in a new tab)
Checked 12 Nov 2026, from public sources.
Not yet verified. We haven’t contacted this business yet. Ask for a written quote before work starts.
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