We Specialize in Commercial Comfort

We are dedicated to installation of new commercial and replacement of inefficient heating and cooling systems, including:

  • Rooftops
  • Boilers
  • Chillers
  • Air handlers
  • Energy management controls

Contact us for a free estimate, and let us handle your next construction project, no matter how big or small, anywhere in central Illinois. We back every new installation with the most thorough product support package in the industry. Our in-house sheet metal fabrication shop enables us to manage our own ductwork, flashing, fabrication, etc. with greater quality, timeliness, and at a lower cost. Compare what you get with Grimm, and then give us a call.

Geothermal Heating & Air Conditioning –
Bring Comfort to the Earth and your Wallet

Geothermal heating and air conditioning, contrary to popular belief, has been around for more than 35 years. It was only until energy costs started soaring that it came to the forefront of the media and people looking at lowering their utility bills.


What is a “geothermal” system?

It takes advantage of the Earth’s ability to store vast amounts of heat in the soil (“geo” means earth and “thermal” refers to heat). This heat energy is maintained at a constant temperature (50°F to 70°F depending on latitude) in the soil and near-surface rocks. In Illinois, the soil maintains a 50°F temperature beginning approximately four feet down, well past the winter frost line.


Geothermal heating systems, also called ground-source heat pumps, “capture” this steady supply of heat energy and “move” it from the Earth and through a home or building. Basically, once installed, a home or building owner will use much less energy, save money each month, and reduce the amount of pollution produced by fossil fuel systems.


How does this work?

A heat pump is a mechanical device that transfers heat from one source to another. Ground-source units pull heat from the earth and transfer it to homes or buildings. Heat pumps (despite their name) can provide both heating and cooling. The cooling process is simply the reverse of the heating process: heat is taken out of a building and returned to the Earth.


Typical ground-source heat pumps transfer heat using a network of tubes, called “closed loops.” Basically, the loops are filled with water, refrigerant or an anti-freeze solution. They run through the ground in the vicinity of a building and the liquid absorbs the Earth’s heat energy. Then, this warmed liquid is pumped back through the system into the building. This process provides heat to the building space. Once the fluid passes through the building and transfers its energy, it flows through the loop system back to the Earth and the process repeats itself.


In the summertime, these systems “reverse” into cooling mode. Technically, the system does not “run backwards.” Instead, a series of valves enables the system to switch the “hot” side and the “cold” side. The heat from the building is transferred to the liquid in the loop and this liquid is pumped back into the ground. When the ground source heat pump is in cooling mode, it usually has an excess of warmed liquid in the system. This liquid can heat water for the building and basically eliminate the use of the hot water heater during the summer months.