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Geothermal Heating And Cooling: The Go-To System When Switching Out Your FurnaceGeothermal heating and cooling systems are the most energy-efficient home comfort systems you can buy. Rather than burning fossil fuels for heating or using ozone-depleting refrigerants for cooling, a geothermal heating and cooling system uses renewable (and free) heat from the earth.

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"Technician (Jim) performed biannual maintenance. Very thorough. Answered questions, explained how to utilize controls to optimize performance. Can’t imagine a better experience."

Joseph Muhler, II
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David N.
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"Very friendly and quick service, even on short notice. We will be able to sleep comfortably tonight with our fixed air conditioner! Thank you, Hartman Brothers!"

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"Once again, technician was very nice. Completed work efficiently. No complaints."

Dennis M.
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"Caleb did a great job. He is thorough and answered all of my questions."

Rodney H.
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"Very thorough with my furnace and very knowledgeable."

Ruth P.
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"It was good to see Ked again. I have had confidence in him when he did maintenance work on my system in the past and I continue to today. Thanks, Ked!"

Paul N.
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