Sterling HVAC’s Xcelon system is the first rooftop makeup-air unit that combines innovative hydronic condensing boiler technology with advanced air distribution and heat-recovery methods for levels of efficiency up to 98 percent, the company says. Xcelon utilizes a factory-charged, closed-loop, 35 percent glycol mix for freeze protection with no separate water supply required.

 Xcelon HVAC
260 N. Elm St.
Westfield, MA 01085
(413) 564-5515
Fax: (413) 568-9613