Florida summers are no joke. Temperatures sit in the 90s for weeks, humidity makes the air feel even hotter, and your air conditioner may run most of the day from May through October. At McDonald Home Services, we have kept Sarasota and Manatee County homes cool since 1970, and we know that a few simple habits make the difference between a system that coasts through August and one that quits during a heat wave.
This guide combines our summer AC maintenance checklist with the everyday HVAC tips that keep your home comfortable and your energy bills under control all season.
1. Schedule a Professional Tune-Up Before the Heat Peaks
The best time for AC maintenance in Florida is spring, before the system starts running nonstop. A tune-up catches small problems while they are still cheap to fix and before every HVAC company in town is booked solid. A thorough visit includes:
- Checking refrigerant levels and looking for leaks
- Cleaning the indoor evaporator coil and outdoor condenser coil
- Flushing and testing the condensate drain line
- Inspecting electrical connections, capacitors and contactors
- Measuring airflow and temperature drop across the coil
- Lubricating moving parts and checking the blower
Regular maintenance extends the life of your system and keeps it running at peak efficiency when you need it most. Learn more about our AC maintenance and tune-ups.
2. Choose the Right Air Filter and Check It Monthly
A dirty filter chokes airflow, makes the system work harder and drives up your energy costs. With Florida pollen, dust and long run times, filters clog faster than many people expect. Check yours every month in summer and replace it at least every 30 to 60 days, or sooner if it looks gray.
Filter rating matters too. Every filter has a MERV rating that shows how well it captures particles. For most homes, we recommend a MERV 8 to 13 filter. Lower-rated filters let more dust into the system. Much higher-rated filters can be so dense that they restrict airflow and strain a residential blower.
3. Keep the Condensate Drain Line Clear
Your air conditioner pulls a lot of water out of humid Florida air, and that water drains through a small PVC condensate line. Dust and algae can clog it, especially in summer. When it backs up, water can overflow into your home, trip a safety switch that shuts the AC off, or raise indoor humidity.
About once a month during the cooling season, pour roughly half a cup of white vinegar into the drain line’s access port near the indoor unit. The vinegar helps break up algae and slime before they can form a clog. If you see water around the indoor unit or the AC shuts off for no clear reason, call for service.
4. Give the Outdoor Unit Room to Breathe
Take a quick look at your outdoor unit once a month. You don’t need to open it up. Just look and listen:
- Keep at least two feet of clear space around it. Trim back shrubs, vines and grass.
- Remove leaves, twigs and grass clippings from the top and sides.
- If the coil looks dirty, turn off power at the disconnect and rinse it gently with a garden hose on low pressure. Never use a pressure washer, which can bend the delicate fins.
- Listen for rattling, buzzing or grinding during a cooling cycle, and note any bent fins or damaged insulation on the refrigerant lines.
5. Set the Thermostat Smartly
Every degree counts when the AC runs all day. The U.S. Department of Energy suggests about 78°F when you are home and awake, and a higher setting when you are away. Turning the thermostat way down won’t cool the house faster. It only makes the system run longer.
A programmable or smart thermostat makes these savings automatic by raising the temperature while you are at work and cooling the house before you get home. Also check where your thermostat sits. One in direct sun or above a lamp or TV will read too warm and keep the AC running. If yours seems off, see our guide on whether your thermostat is reading correctly, or ask about smart thermostat installation.
6. Use Ceiling Fans the Right Way
Ceiling fans don’t lower the temperature, but the moving air makes a room feel several degrees cooler. That lets you raise the thermostat without losing comfort. In summer, set fans to spin counterclockwise so they push air down, and turn them off when you leave the room. Fans cool people, not rooms.
7. Keep Humidity in Check
In Florida, humidity is often what makes a home feel uncomfortable. Aim to keep indoor humidity below about 50 percent. Signs that it is too high include a clammy feel, condensation on windows and a musty smell. Run bathroom and kitchen exhaust fans while showering and cooking. If your AC cools the air but the house still feels damp, a whole-home dehumidifier or a properly sized system can help. See our dehumidifier options.
8. Seal Leaks and Block the Sun
Cool air escaping through gaps is money going out the window. ENERGY STAR estimates that a typical duct system loses 20 to 30 percent of its air to leaks and poor connections, and in Florida many of those ducts run through a scorching attic. Check weatherstripping around doors, caulk gaps around windows, and make sure attic insulation is adequate.
Close blinds and curtains on east-facing windows in the morning and west-facing windows in the afternoon. For more ways to cut cooling costs, read our tips to lower energy bills during Florida heat.
9. Prepare Your AC for Hurricane Season
Hurricane season runs June 1 through November 30, right through the hottest months. Before a storm, clear loose items away from the outdoor unit and turn the system off at the thermostat and the outdoor disconnect if a power outage or flooding is likely. After the storm, check the unit for debris, standing water or damage before you turn it back on. If the unit was under water, have a technician inspect it first.
10. Know the Warning Signs and When to Call the Pros
Call for service right away if you notice:
- Warm air coming from the vents
- Ice on the refrigerant lines or indoor coil
- Water pooling around the indoor unit
- The system turning on and off every few minutes
- Rattling, grinding or squealing noises
- Burning or musty smells from the vents
- An electric bill that jumps without explanation
Small problems found early cost far less than an emergency repair on a 95-degree afternoon. If your system does break down, our emergency HVAC service is here to help.
Is It Time to Upgrade?
If your air conditioner is more than 10 to 15 years old, needs frequent repairs or can’t keep up on the hottest days, a new high-efficiency system may save more than it costs over time. New systems also use the refrigerant required under current federal rules. Learn what the R-454B refrigerant change means for your replacement options.
Beat the Heat With McDonald Home Services
Florida summers are tough, but your home doesn’t have to be. With the right maintenance and expert support, you can stay cool, comfortable and energy-efficient all season. From tune-ups to full system replacements, our team is ready to help homeowners across Sarasota, Bradenton and Manatee County.
Call McDonald Home Services at (941) 360-9898 or send us a message for a free estimate on a new system.
Bob Bermudez, MBA, is the President and Owner of McDonald Home Services (Jim McDonald & Sons Heating & Cooling), a family-run HVAC and plumbing company serving Bradenton, Sarasota, and Manatee County since 1970. Before buying the company, Bob spent his career on the manufacturing and distribution side of HVAC — a background that shapes how he advises homeowners on equipment.