A central air conditioner replacement in Janesville typically runs $3,500–$7,500 installed, depending on the unit's SEER rating and your home's ductwork condition. A new gas furnace averages $2,500–$5,500 installed. Replacing both the AC and furnace at the same time often costs less than two separate projects — many HVAC contractors offer combination pricing. Heat pump systems run $5,000–$10,000+ but can significantly reduce energy costs in Rock County's climate.

HVAC manufacturers and most Janesville contractors recommend twice-yearly maintenance: a spring tune-up for your air conditioner before cooling season and a fall furnace tune-up before heating season. Annual maintenance keeps your system running efficiently, catches small problems before they become expensive repairs, and is often required to keep warranty coverage valid. Many Rock County HVAC companies offer maintenance plans at $150–$250/year that include priority scheduling.

Janesville HVAC contractors most commonly install Lennox, Carrier, Trane, Rheem, Goodman, American Standard, and Bryant equipment. Brand choice matters less than proper sizing and installation quality — an oversized or undersized system performs poorly regardless of brand. Ask your contractor to provide a Manual J load calculation to confirm sizing is done correctly for your home. Reputable Rock County HVAC companies will explain brand options and help you choose based on your budget and efficiency goals.

First check your thermostat settings, replace the furnace filter if it's clogged, and make sure the circuit breaker for the furnace hasn't tripped. Check that the furnace's power switch (looks like a light switch) is on. If those steps don't resolve it, call an HVAC contractor — most Janesville heating companies offer 24/7 emergency service in the winter. While waiting for service, keep interior doors closed to retain heat and use space heaters safely if available.

Many full-service HVAC and electrical companies in Rock County now offer smart thermostat installation (Nest, Ecobee, Honeywell) as a standard service. EV charger installation is typically handled by licensed electricians, though some HVAC companies with electrical divisions offer it. When contacting Janesville HVAC contractors, ask specifically about these services if needed — not all companies offer them but many can recommend a trusted partner.

Signs your system may need replacing rather than repair: it is 15+ years old, requires increasingly frequent repairs, no longer heats or cools the house evenly, energy bills have increased significantly, or the repair cost exceeds 50% of the replacement cost. If the system is under 10 years old and the repair is isolated (a capacitor, relay, or refrigerant recharge), repair usually makes sense. Get a second opinion from another Rock County HVAC contractor if you're unsure.