Advanced Geothermal Technologies now has units that have been in operation for over a decade. Below is a collection of reviews, newspaper features, and field results offered by a few of our many satisfied customers.

Heating and Cooling Season Comparison
These two pie charts illustrate the dramatic effect that installation of a Great Aire Comfort System; had upon a 2,300 square foot home in Collegeville, Pennsylvania. The system was put into service in September 1992. The data was taken from actual electric and oil bills shared with us by the homeowner. The heating season was considered to be October through April and the cooling season from May through September.

In the Headlines

Our business has been featured in articles by both The Philadelphia Inquirer and The Post (Montgomery County, Southeastern Pennsylvania). Click below for these articles.


The Philadelphia Inquirer, Sunday, February 27, 1994


by C.L.Chase of The Montgomery Post, Wednesday, October 21, 1992

Satisfied Customers

Perhaps nothing speaks more highly of our product than its endorsement by our customers. Below are two of the many letters we have received regarding our systems.

from Robert Mayfield of Devon, Pennsylvania

from Harley Lee of New Gloucester, Maine

There is nothing we would like more to do than to make you our newest satisfied customer. If you are interested in our product for your home or business, please mail us for more information.