4B Systems, Inc.
- Website checked
AA Service Co.
Northbrook heating, cooling and backup power contractor offering furnace, boiler and heat pump repair, plus standby generator installation and panel upgrades. Open around the clock, every day, and in business since 1965.
What they do
The company installs and repairs furnaces, boilers, heat pumps, ductless mini-splits and air conditioning, and it also handles water heaters and frozen pipes. For backup power, it installs generators and upgrades electrical panels so they can carry the added load. Sump pump work and structural drying are also on its list. Emergency service is offered, and the company is open around the clock, every day. Financing is available for installations. Lennox is among the brands it works with. Based in Northbrook and operating since 1965, the company also serves Glenview, Evanston and Skokie.
- Sump pumps
- Generators
- Furnace repairs and installs
- Boiler service
- Heat pumps
- Ductless mini-splits
Listed under Backup power, Basement flooding and sewer backup, Heating and cooling emergencies
Where they work
What we checked
- Its own website lists this work: aaserviceco.com/electrical-services/generators (opens in a new tab)
Checked 12 Nov 2026, from public sources.
Not yet verified. We haven’t contacted this business yet. Ask for a written quote before work starts.
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