Illinois Cities Served

Durand, IL
Harvard, IL
Poplar Grove, IL
Capron, IL
Shirland, IL

South Beloit, IL
Capron, IL
Rockton, IL
Roscoe, IL




Wisconsin Cities Served

Janesville, WI   

Elkhorn, WI 
Delavan, WI 
Whitewater, WI 
Fort Atkinson, WI 
Milton, WI 
Edgerton, WI 
Macfarland, WI 
Madison, WI 
Evansville, WI 
Orfordville, WI 
Darien, WI
Beloit, WI

Lake Geneva, WI
Mukwonago, WI
East Troy, WI
Lake Mills, WI
Brodhead, WI
Monroe, WI
Deerfield, WI
Oregon, WI

Evansville, WI 
Albany, WI
Juda, WI 
New Glarus, WI
Jefferson, WI
Johnson Creek, WI
Stoughton, WI
Cambridge, WI
Walworth, WI

​​Wisconsin Counties Served 
Rock County, Wisconsin
Walworth County, Wisconsin
Dane County, Wisconsin
Jefferson County, Wisconsin
Green County, 

Fulfilling  your  heating, cooling and hot water needs all in one system.


The ground absorbs nearly half of the solar energy our planet receives. As a result, the earth remains at a constant, moderate temperature just below its surface all year round. However, air temperature varies greatly from summer to winter, making air source (traditional) heating and cooling least efficient when you need it the most.

Geothermal heating and cooling systems take advantage of the stable temperature underground using a piping system, commonly referred to as a “loop.”   Water circulates in the loop to exchange heat between your home, the ground source heat pump, and the earth, providing heating, cooling, and hot water at remarkably high efficiencies.

In fact, Water Furnace Geothermal heating and cooling systems are 400-600% efficient and can cut your heating, cooling, and hot water costs by up to 80%.

Are you paying too much on your heating, cooling and hot water bills?


Geothermal is a great way to cut down on those costs, WaterFurnace geothermal systems use the free, renewable energy found in your own back yard to save up to 70% on heating, Cooling, and hot water costs. The WaterFurnace 7 Series® provides homeowners the ultimate in comfort and performance and represents our finest products. This line is for those who accept only the best and is built using the latest technologies and highest standards. 

​​​​"wE'RE NOT COMFORTABLE Until YOU ARE"

heating, air conditioning, Geothermal & Indoor air Quality Contractor Meeting the  needs with OVER 40 years

Geothermal HVAC 

Why choose Geothermal?

​​​​​DON-MARTIN HEATING, COOLING & GEOTHERMAL