They are: Air Power Inc., Fairfield, N.J.; Climate Systems Inc., Williston, VT; Guardian Environmental Systems Inc., Livonia, MI; Hermanson Co., Kent, WA; and Pasterkamp Heating and Air Conditioning Inc., Denver.

The Unified Group was founded in 1998. Its 33 member companies represent more than $450 million in revenue. For information call Rich Bielak or Julie Bishop at 888-714-5990.