Don-Martin Heating, Cooling & Geothermal Inc.
HVAC contractor in Janesville, WI 53545
About this company
Don-Martin Heating, Cooling & Geothermal Inc. is listed as an HVAC contractor at 4101 Commercial Dr in Janesville, Wisconsin, in Rock County. It is one of 3 HVAC companies in ZIP 53545.
Other HVAC companies nearby
Al Beyers Indoor Comfort Systems1715 Newport Ave, Janesville
1.0 mi(608) 752-6610
FabTek Custom Sheet Metal & HVAC4716 N John Paul Rd, Milton
1.5 mi(608) 390-3003
Hovland's Heating & Air Conditioning4727 N Colt Dr, Janesville
1.5 mi(608) 758-1981
A & A Heating & Air Conditioning4731 N Colt Dr, Janesville
1.6 mi(608) 754-9220
Lloyd's Plumbing & Heating Corp2352 W US Highway 14, Janesville
1.7 mi(608) 756-2626
Housing market around ZIP 53545
Figures describe the local area, not this company.
Typical home value$286,000+5.1% past year · +109% in 10 years
Typical rent$993+6.0% past year
12-month value outlook+4.4%
New homes permitted, 2025388Rock County
Days to sale agreement8Janesville metro · 11 a year ago
Listings with a price cut27.6%Janesville metro
Sale price vs list100.7%Janesville metro
New construction sales16Janesville metro, Aug · −30% from last year
Source: Zillow (home values, rent, outlook and metro sales), data through Sep 2026. Permits: U.S. Census Bureau.
Typical home value, last 10 years
Source: Zillow Home Value Index, Sep 2026.
Local building angle: Rock County permitted 388 new homes in 2025, including 16 apartment units. 7% of the homes in this ZIP were built since 2000.
Local figures are estimates from public records and Zillow housing data, updated regularly.