The New Homeowner's First Summer: Don't Make These AC Mistakes
By Coastal Air Plus | Serving Myrtle Beach and Charleston, SC Since 1947
Welcome to homeownership in coastal South Carolina. You picked a great place to live and one of the more demanding climates an AC system will ever face. We have been helping folks figure out their HVAC systems on the South Carolina coast since 1947, and every spring we hear from new homeowners who are heading into their first summer with questions they are not quite sure how to ask.
This post is for you. None of what follows is a judgment. We were all first-time homeowners at some point. These are just the things we wish someone had told us early. You can also explore our residential AC services page any time you want a bigger picture of what your system can do.
South Carolina summers are different from anywhere else. The heat is serious. The humidity is relentless. A coastal home has its own specific demands. Knowing a few basics now will save you real money and a lot of frustration between now and October.
Mistake 1: Assuming the System Does Not Need Maintenance Because It Worked Fine Last Year
This is the most common one we see with new homeowners. You bought the house, the AC was running when you moved in, and it ran fine through the fall and winter. So it should be fine, right?
Your HVAC system is a lot like your car. You take it in for an oil change even when it is running well. You do not wait for a problem. Regular maintenance keeps the system running efficiently, catches small issues before they become expensive ones, and extends the life of the equipment. Skipping it does not save money. It just moves the cost further down the road and usually makes it bigger when it arrives.
If you do not know whether the previous owners had the system serviced, assume it has not been done recently and schedule a visit before summer. Our technicians will check the things you cannot easily check yourself: refrigerant levels, coil condition, electrical connections, condensate drainage, and overall system performance. They take their time and walk you through what they find. That is how we do it.
Mistake 2: Constantly Adjusting the Thermostat
We get it. The house feels warm, so you drop the thermostat to 68. Then it gets cool, so you bump it to 76. Then a family member changes it again. The thermostat becomes a dial everyone fiddles with throughout the day.
Here is what most new homeowners do not realize: your AC system does not work faster when you set it lower. It runs at the same speed regardless of whether the target is 68 or 78. Setting it to 65 when you want 72 does not get you to 72 faster. It just makes the system run longer and work harder than it needs to.
Pick a comfortable temperature and leave it there. Something in the 74 to 76 range is reasonable for a coastal South Carolina summer. If you want to save money while you are away, bump it up by a few degrees rather than turning it off entirely. Coming home to a house that has been sitting at 90 degrees takes a long time and a lot of energy to recover, especially in July.
Mistake 3: Closing Vents in Rooms You Are Not Using
This one sounds logical. You are not using the guest bedroom, so you close the vent to save energy. Reasonable idea. Unfortunately, it does not work that way.
Your HVAC system was designed and sized to push a certain volume of air through the ductwork. When you close vents, that air does not disappear. It still gets pushed through the system, but now it has nowhere to go. Pressure builds up in the ducts, which stresses the blower motor, can cause the evaporator coil to freeze, and actually makes the system less efficient rather than more.
Leave your vents open. If you have rooms that consistently feel too hot or too cold, that is worth a conversation about airflow and duct balance, but closing vents is not the fix.
Mistake 4: Ignoring Warning Signs
New homeowners sometimes do not know what normal sounds like. So when the system starts making a noise that was not there before, or when airflow seems weak out of a vent, or when the house takes longer than usual to cool down, it gets chalked up to the system just being old or the house being different from the last place they lived.
Pay attention to changes. If your system is making a sound it did not used to make, that is worth a call. Banging, grinding, or squealing are not normal operating sounds. If airflow out of a vent seems noticeably weaker than the others, that is a duct or system issue worth looking at. If your energy bills jump significantly from one month to the next without a clear reason, the system may be working harder than it should.
None of these things mean disaster. Some are minor. But catching them early is almost always less expensive than waiting. You will not be oversold when you call us. If something is fine, we will tell you it is fine.
Mistake 5: Not Knowing Where Your Shutoff and Breaker Are
Before summer starts, know two things: where your thermostat is (you probably know this one), and where the breaker for your HVAC system is. Also find the emergency shutoff switch, which is usually a red switch near the air handler that looks like a light switch.
If your system ever starts making a serious noise, if you smell burning, or if something seems genuinely wrong, being able to shut it off quickly matters. This is basic homeowner knowledge that is easy to find out now and very useful to have in an emergency.
While you are at it, locate your air filter. This leads us to the next one.
Mistake 6: Not Changing the Filter
The air filter in your system catches dust, pollen, pet hair, and other particles before they get into the ductwork and the air handler. When it gets clogged, airflow through the system drops. A system struggling to pull air through a clogged filter runs less efficiently, works harder, and puts more wear on the blower motor.
On the South Carolina coast, where salt air, pollen season, and humidity all contribute to what ends up in your filter, the standard advice of changing every three months is a minimum, not a rule. Check yours monthly until you know how fast it loads up in your specific home. A coastal home near the beach can go through filters faster than you would expect.
Filters are inexpensive. Replacing a blower motor because the system has been straining against a clogged filter for six months is not. If you want more detail on filter types and what works best in coastal conditions, our residential maintenance page is a good reference.
Mistake 7: Setting Unrealistic Temperature Expectations
This one is especially relevant for older homes, historic homes in Charleston, and beachfront properties that were not built with the tight construction of modern houses.
Your AC system was sized for your home. It was designed to maintain a temperature roughly 20 degrees below the outdoor temperature on a typical summer day. On a 95-degree day in Myrtle Beach with high humidity, expecting the house to hold 68 degrees while every door to the porch is open is asking more than the system was designed to deliver.
A reasonable goal is 74 to 76 degrees on the hottest days. If your system is running constantly and cannot get the house below 78 degrees when it is 98 outside, that may be the equipment's design limits, not a malfunction. That said, if you had different expectations based on what the home was like when you viewed it, or if performance seems genuinely worse than it should be, call us. We will come take a look and give you a straight answer.
One Thing to Do Right Now
If you have not already, sign up for a maintenance visit before summer. Our VIP Maintenance Club puts you on a regular schedule so this never falls through the cracks. It is the single most useful thing a new homeowner can do for their HVAC system. Your car gets oil changes. Your HVAC system deserves the same attention.
And if you have questions, call us. No question is too basic. We have heard every one of them over the past 75 years and we are genuinely glad to help. That is what neighbors do.
Rest easy knowing that whatever comes up this summer, you have a team in your corner that will be straight with you, show up when they say they will, and fix things the correct way the first time.
At Coastal Air Plus, creating lasting relationships is what we are all about. We are not here to make money off one visit. We want to be your HVAC company for as long as you own that home.
Call us at 240-509-0953 or visit coastalairplus.com/request-service. We serve Myrtle Beach and Charleston, SC and the communities in between. Simple. Reliable. Coastal Air Plus.
