Friendly, local service for your AC, furnace, or heat pump — with an honest price before any work starts.
Central AC, ductless mini-splits, and heat pumps — repaired, replaced, or tuned up before summer hits.
Learn moreFurnaces, boilers, and heat pumps kept safe, efficient, and ready for a Pennsylvania winter.
Learn moreDuctwork, ventilation, and indoor air quality so every room feels right and the air stays fresh.
Learn moreA spring cooling or fall heating tune-up that catches small problems early, extends equipment life, and keeps bills down.
Learn more
D1 is Division One Mechanical, owned and run by Tom Reilly and based right here in Collegeville. When you call, you’re talking to the people who will actually do the work.
“I treat every home like it’s my own — clean work, straight answers, and a fair price.” — Tom
We explain the problem and give you the price. Nothing starts until you say yes.
Repair or replace? We’ll lay out your options honestly — including when a repair makes more sense.
Licensed and insured, and we treat your home with respect from start to finish.
Easy online booking, plus 24/7 emergency service when the heat or AC quits.
Pick a time that works for you online, or call and talk to a real person.
We offer 24/7 emergency service for homes too.