HVAC Services in Sullivan, WI

Dependable HVAC for Sullivan Homes

Sullivan may be a small Jefferson County village, but a failed furnace here is just as urgent as anywhere else — and often harder to get a contractor to show up for. On Time Heating & Cooling covers Sullivan with real 24/7 dispatch at (262) 671-8999: a person answers, and you get a confirmed window.

We are an owner-operated Waukesha company. Shane Herro founded On Time in 2019, still runs calls, and trains the crew personally — the reason homeowners have rated us 5.0★ across 480+ Google reviews.

Services Available in Sullivan

• Furnace repair, replacement & maintenance — gas and propane
• AC repair & installation
• Heat pumps & dual fuel
• Ductless mini-splits
• Water heaters & tankless
• Boilers, air quality & duct cleaning

Village and Farmstead Properties

Around Sullivan we work on village homes, farmhouses with layered heating history, and rural properties running propane and well water. Each one gets the same process: diagnose what is actually installed, run honest load math before any replacement, and commission the finished install with measurements rather than assumptions.

Fair Options Without the Pressure

Our Free Second Opinion reviews any competing quote free of charge. Qualified buyers can spread costs with 0% intro APR Wisetack financing, and the On The Dot Club covers seasonal tune-ups with priority dispatch.

Book Sullivan Service

Call (262) 671-8999 or book online. We also serve Ixonia, Dousman, and Oconomowoc.