HVAC Questions, Answered

How often should I have my AC maintained?

In Central Florida, we recommend twice a year. Your system runs almost all year here, so a visit before the summer heat and another later in the year gives us two chances to clean the drain line and coils and catch worn parts before they fail. If twice a year isn't doable, aim for at least once a year, ideally in the spring. Our Comfort Club plans include two visits a year starting at $189, or you can book a one-time AC tune-up for $129 per system.

How do I clear my AC drain line?

Your AC pulls a lot of water out of Florida air, and algae and sludge can clog the drain line that carries it away. Here's a safe way to clear it yourself:

1. Turn the system off at the thermostat, then switch off the AC breaker at your electrical panel.
2. Find the drain line near the indoor unit. It's usually a white PVC pipe with a T-shaped access fitting and a cap or plug on top.
3. Remove the cap and slowly pour in about 1 cup of distilled white vinegar (or whatever your system's manufacturer recommends). Don't mix vinegar with bleach or other cleaners.
4. Wait about 30 minutes, then slowly pour in clean water to flush the line. If the water backs up instead of draining, the line is clogged.
5. For a clog, go outside and find where the drain line ends, usually near the outdoor unit or the foundation. Hold a wet/dry vac hose tightly over the end for a minute or two to pull the clog out.
6. Put the cap back on, turn the breaker back on, then turn the system on at the thermostat.

Call us at (407) 452-9107 if water is overflowing, the float switch (the safety switch that shuts the AC off when the drain backs up) keeps tripping, or you're unsure about any step. Every Comfort Club visit includes drain line cleaning and treatment.

How often should I change my air filter?

Check it once a month. Standard 1-inch filters usually need replacing every 1 to 3 months, and in Florida, where the AC runs most of the year, closer to monthly is common, especially with pets, allergies or nearby construction. Thicker media filters can last longer, so follow the filter maker's guidance. A clogged filter chokes airflow, raises your power bill and can even make the coil freeze. Comfort Club Plus and Elite members get standard 1-inch filters included (see the plans).

Why is my AC running but not cooling?

Start with the easy checks: make sure the thermostat is set to Cool and below the room temperature, replace a dirty air filter, and confirm the breakers for both the indoor and outdoor units are on. Then look outside to see whether the outdoor unit is running and isn't blocked by plants or debris. If you see ice on the refrigerant lines, turn the system off and let it thaw. If it's still not cooling, the cause is often a failed capacitor, a dirty coil, a refrigerant leak or a clogged drain that tripped the safety switch, and those need a technician. Learn about our AC repair or call us.

Why is there ice on my AC lines or coil?

Ice usually means the system isn't getting enough airflow, often from a clogged filter, closed or blocked vents, a dirty coil or a blower problem. It can also mean the system is low on refrigerant because of a leak. Turn the system off at the thermostat (you can set the fan to On to help it thaw), replace the filter if it's dirty, and keep a towel handy, since melting ice can fill the drain pan. Don't chip at the ice. If it comes back after thawing, call us, because refrigerant leaks need a licensed technician.

Why is water leaking around my indoor unit?

Most of the time it's a clogged condensate drain line, which is one of the most common AC problems in humid Central Florida. A cracked or rusted drain pan, or ice melting off a frozen coil, can also cause it. Turn the system off to limit water damage, then try clearing the drain line. If the water keeps coming or you can't find the source, we can help.

Do you offer emergency AC service?

Yes. We're open 24 hours a day, 7 days a week. If your AC stops working, call (407) 452-9107. For urgent problems, calling is the fastest way to reach us.

What's the life expectancy of an air conditioner?

In Florida, a central air conditioner typically lasts about 10 to 15 years, and often toward the lower end of that range. Our systems work harder than most: long cooling seasons, constant humidity and, closer to the coast, salt air all add wear. Heat pumps have a similar lifespan, since they handle both cooling and heating here. Regular maintenance is the best way to get the most years out of your system, and when it is time to replace, we'll give you honest options for AC installation.

Should I repair or replace my AC?

A handy rough guide is the "5,000 rule": multiply the age of your system in years by the repair cost. If the result is more than 5,000, replacement is often worth considering. For example, a $500 repair on a 12-year-old system comes to 6,000. It's only a starting point: how often the system breaks down, your energy bills, how comfortable the house is and whether it uses an outdated refrigerant like R-22 all matter too. We'll give you an honest recommendation with no upselling, and the decision is yours. See AC repair and AC replacement.

What does SEER2 mean?

SEER2 stands for Seasonal Energy Efficiency Ratio 2. It's the federal rating for how efficiently an air conditioner or heat pump cools over a season, and the higher the number, the less electricity it uses for the same cooling. SEER2 replaced the older SEER rating in 2023 with a test that better reflects real homes and ductwork, so SEER2 numbers run a little lower than old SEER numbers for the same equipment. In Florida, a new split-system central air conditioner must be at least 14.3 SEER2 if it's under 45,000 BTU/h (about 3.75 tons), or 13.8 SEER2 for 45,000 BTU/h and up. Those match the old 15 and 14.5 SEER minimums. A higher rating usually costs more up front and saves more on power bills over time, and we'll help you weigh it when you replace your system.

What size AC do I need?

It depends on your home, not just its square footage. The right size comes from a load calculation that looks at things like insulation, windows, sun exposure, ceiling height, ductwork and how many people live there. A system that's too big cools quickly but doesn't run long enough to remove humidity, so the house feels cold and clammy. One that's too small runs nonstop on summer afternoons. We'll look at your home and recommend the right fit (more on AC installation).

What areas do you serve?

We're based in Kissimmee and serve homes and businesses across Osceola, Orange and Polk counties, including Kissimmee, Buenaventura Lakes, St. Cloud, Celebration, Hunters Creek, Poinciana, Orlando, Lake Nona, Meadow Woods, Southchase, Lake Buena Vista, Narcoossee and Four Corners. See all of our service areas. Don't see your neighborhood? Call (407) 452-9107 and we'll let you know if we can help.

Are you licensed and insured?

Yes. Master Cooling Mechanical LLC is a licensed and insured Florida Certified Air Conditioning Contractor, license #CAC1821543. You can look up our license on the Florida Department of Business and Professional Regulation website. Learn more about us.

How do I book a service call?

The easiest way is to tap Book online, here or on any page, and pick a time that works for you. You can also call us 24/7 at (407) 452-9107, message us on WhatsApp, or send a request through our contact page.

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Do you service commercial refrigeration?

Yes. We repair and maintain walk-in coolers and freezers, reach-ins, ice machines, ice cream and soft-serve machines, slushie machines, refrigerated display cases and commercial rooftop units for restaurants, stores and other local businesses. If it gets cold, we can fix it. See our commercial refrigeration page.