Memorial Day weekend is more than just the unofficial start of summer — it's your last, best window to get your air conditioning system in shape before the heat arrives. Once temperatures climb and humidity sets in, HVAC technicians get slammed with emergency calls, and you'll be waiting days for a repair that could have been prevented with a little prep work in May.
Think of summer A/C maintenance the way you think of an oil change. Skip it, and the car still runs — until it doesn't. A well-maintained system cools more efficiently, lasts longer, and keeps your energy bills in check. Here's exactly what you should do before summer arrives.
If you only do one thing on this list, make it this. Your air filter is the lungs of your HVAC system. As it collects dust, pet dander, pollen, and debris over the months, it becomes increasingly clogged — forcing your system to work harder to push air through. That extra strain drives up your energy bill and accelerates wear on the equipment.
A fresh filter takes five minutes to swap out and costs a few dollars. As a rule of thumb, check your filter monthly during peak cooling season and replace disposable filters every one to three months. If you have pets or live with allergy sufferers, lean toward the more frequent end of that range.
Your outdoor unit spent the winter collecting leaves, dirt, twigs, and who knows what else. All of that debris blocks airflow, forcing the condenser to work harder than it should, and on the hottest day of the year, a struggling condenser is the last thing you want.
Before you turn on the system for the season:
Turn off power to the unit at the circuit breaker
Remove any leaves, branches, or debris from around and inside the unit
Gently rinse the coils with a garden hose — avoid high-pressure spray, which can bend the fins
Trim back any shrubs or vegetation to maintain at least two feet of clearance on all sides
A clean condenser releases heat efficiently. A dirty one doesn't — and that's when breakdowns happen.
Walk through your home and inspect every supply and return vent. Make sure they're open, unobstructed, and free of dust buildup. It sounds simple, but closed or blocked vents disrupt airflow throughout your entire system, causing some rooms to cool poorly while putting unnecessary strain on the equipment.
If you notice dust bunnies accumulating around your vents, that's also a sign it may be time to think about duct cleaning, especially if you've noticed your home getting dusty quickly after cleaning or your allergies worsening when the A/C runs.
As your A/C cools the air, it removes moisture — and that moisture has to go somewhere. It drains through a condensate line, which can become clogged with algae and debris over time. A blocked drain line can cause water to back up into your system, trigger a shutdown, or worse, cause water damage to your home.
You can often clear a minor clog yourself by flushing the line with a mixture of water and white vinegar. If you're not sure where the drain line is or suspect a more significant blockage, this is a good item to flag for your professional tune-up.
If you're still running an older programmable — or worse, manual — thermostat, summer is a great time to upgrade. Smart thermostats learn your household's patterns and automatically adjust temperatures to maximize both comfort and efficiency. Studies suggest they can reduce total HVAC energy use by up to 10%, which adds up meaningfully over a full cooling season.
Beyond the savings, smart thermostats give you remote control from your phone, so you're never cooling an empty house, and you can always pre-cool before you arrive home.
DIY maintenance goes a long way, but it doesn't replace a professional inspection. A certified HVAC technician can catch things you can't — refrigerant levels, electrical connections, worn capacitors, early signs of compressor trouble. Catching a small issue in May is far less expensive than an emergency repair in July.
Schedule your tune-up now, while technicians have availability. Once summer heat hits, appointment windows tighten and wait times stretch. Booking in late spring means flexible scheduling, faster service, and peace of mind heading into the hottest months.
A little attention now pays dividends all summer long. Replace the filter. Clear the condenser. Check your vents. Flush the drain line. Consider a thermostat upgrade. And book that tune-up before the calendar fills up.
Your A/C works hard enough when the weather cooperates. Give it a fighting chance before the heat arrives and it'll keep you cool all season without the drama.
