Anyone who's spent a July in Evansville knows the drill — the heat rolls in off the Ohio River, humidity climbs past 80%, and your air conditioner becomes the single most important appliance in your house. But too many homeowners wait until that first 95-degree day to find out their AC isn't keeping up. By then, every HVAC company in Vanderburgh County is booked solid.
The smart move? Spot the warning signs early. Here's what to watch for before Evansville's summer heat kicks into full gear.
1. Weak or Warm Airflow From Your Vents
If you hold your hand up to a vent and the air feels lukewarm or barely moves, something's off. This could point to a failing compressor, a clogged filter, or ductwork that's come loose. In older homes around the Riverside and Stringtown neighborhoods, duct issues are especially common — many of these homes were built before central air was standard, and retrofitted ductwork tends to degrade faster.
What to do: Replace your filter first (it's the cheapest fix). If that doesn't solve it within a day, call a technician. Running a system with weak airflow forces the compressor to work harder, which can turn a $150 repair into a $2,000 replacement.
2. Strange Sounds — Grinding, Squealing, or Banging
A healthy AC unit has a consistent hum. Anything else is your system asking for help. Grinding often means motor bearings are shot. Squealing usually points to a worn belt. Banging or rattling could mean a loose part inside the compressor housing.
Evansville's weather swings are hard on outdoor units. We go from freezing temps in January to brutal heat by June, and that thermal cycling stresses metal components. Units installed on uncovered pads — especially in open areas like Newburgh or the west side near USI — take a beating from weather exposure.
3. Higher Utility Bills Without a Clear Reason
Vectren delivers your gas and electric, and if you've noticed your summer bills creeping up year over year without a rate increase to explain it, your AC may be losing efficiency. A system that used to cool your house in 20 minutes but now runs for an hour to do the same job is burning money.
Compare your June-through-August bills from the last two years. If there's a 15% or greater jump and your usage habits haven't changed, have a technician check your refrigerant levels and compressor performance.
4. Short Cycling — Turning On and Off Frequently
Your AC should run in steady cycles of 15 to 20 minutes. If it kicks on, runs for five minutes, shuts off, and repeats, that's called short cycling. It's hard on the system and usually means one of three things:
- The unit is oversized for your home (common in flipped houses where contractors installed whatever was cheapest)
- The refrigerant charge is low
- The thermostat is malfunctioning or poorly placed
Short cycling can cut your system's lifespan in half. Don't ignore it.
5. Moisture or Leaking Around the Unit
A little condensation around your indoor air handler is normal. Puddles or active dripping are not. If you see water pooling near your furnace (where the evaporator coil sits), the drain line is probably clogged. In Evansville's humid climate, algae growth in drain lines happens fast — we see it constantly during summer service calls.
A clogged drain can back up into your ceiling or walls, causing water damage that costs far more than the HVAC repair itself.
6. Your System Is More Than 10 Years Old
The average central AC unit in Indiana lasts 12 to 15 years. If yours is pushing a decade or more, you're on borrowed time. Older systems use R-22 refrigerant (Freon), which has been phased out and is expensive to recharge. Even if the system runs, it's likely operating at 60% of its original efficiency.
Modern units with SEER2 ratings of 16 or higher can cut your cooling costs significantly. Many Evansville homeowners qualify for Vectren (now CenterPoint Energy) rebates when upgrading to high-efficiency systems.
Don't Wait Until the First Heatwave
Every HVAC company in the Evansville area gets slammed when the first hot spell hits. Wait times stretch to days, and emergency service calls cost more. Schedule a tune-up in April or May — most companies offer seasonal maintenance specials under $100, and they'll catch small problems before they become mid-July emergencies.
If you're noticing any of these signs, get it checked now. A $200 repair in May beats a $5,000 replacement in July every time.