Michigan summers don’t ease you in — they arrive with humidity, heat waves, and weeks where your air conditioner works as hard as it will all year. A little preparation and a few smart habits make the difference between a comfortable summer and a mid-July emergency repair call.

At Macklin Heating and Cooling, we keep cooling systems running across Genesee County and surrounding communities. Here are our most practical summer air conditioning tips, plus what to do when your HVAC can’t keep up with the heat.

Summer Air Conditioning Tips That Actually Work

These aren’t complicated — but they make a real difference when the temperature climbs:

Change your filter on schedule. A dirty filter is the single most common cause of poor cooling. Check it monthly in summer; change it at least every one to three months.
Set it and leave it. Pick 76 to 78°F when you’re home and let it run. Constant adjustments make the system work harder, not smarter.
Use a programmable or smart thermostat. Raise the temperature a few degrees while you’re out, and have it cool back down before you get home.
Close blinds and curtains on sunny windows. Direct sunlight can add a surprising amount of heat to a room — shade is free cooling.
Run ceiling fans counterclockwise. Fans don’t lower the temperature, but the breeze makes a room feel about 4 degrees cooler, so you can set the thermostat higher.
Keep vents open and unblocked. Closing vents doesn’t save energy — it strains your system. Move furniture and rugs away from supply registers.
Clear the outdoor unit. Keep two to three feet around the condenser free of grass, leaves, and debris for proper airflow.
Skip the oven on the hottest days. Grilling outside instead of baking indoors keeps your kitchen — and your AC’s workload — cooler.

Schedule a Tune-Up Before the Heat Hits

The best summer AC tip is the one you do in spring. A professional tune-up cleans the coils, checks refrigerant levels, tests electrical components, and clears the condensate drain — catching small issues before they become August breakdowns. It also keeps your efficiency where it should be, which shows up directly on your energy bill. Think of it as cheap insurance for the hardest season your equipment faces.

My HVAC Can’t Keep Up With Heat — Why?

If your air conditioner runs all day but the house still feels warm, something’s off. The most common causes:

Dirty Filter or Coils

Restricted airflow is the number one reason systems underperform. Before assuming anything serious, replace the filter and make sure the outdoor unit is clean and clear.

Low Refrigerant

If your AC can’t cool like it used to, a refrigerant leak may be the cause. Low refrigerant reduces cooling capacity and can damage the compressor — and it’s not something you can top off yourself.

An Aging or Undersized System

Every AC loses capacity as it ages, and systems that were marginal to begin with fall behind during heat waves. If your unit is 15-plus years old and struggling every summer, this is the pattern to expect.

Duct Leaks and Poor Insulation

Cooled air escaping into your attic, or heat pouring in through thin insulation, can overwhelm even a healthy system. If some rooms cool fine and others don’t, ducts are a prime suspect.

Air Conditioner Can’t Keep Up on Hot Days: What to Do

On extreme heat days — 95°F and humid — even a healthy system may run constantly and sit a few degrees above your set point. That’s normal during a heat wave. But if your AC falls behind on ordinary summer days, or the gap keeps growing year over year, take these steps:

Replace the air filter and clear the outdoor unit.
Close curtains on sunny sides of the house and run ceiling fans.
Avoid heat-generating appliances during the hottest afternoon hours.
Check that all supply vents are open, even in unused rooms.
If it still can’t keep up on a normal 85-degree day, schedule a professional inspection — that gap between “struggling during a heat wave” and “struggling every day” is the line between normal and a problem.

Our A/C installation and repair team can diagnose what’s holding your system back — whether it’s a fixable issue or an honest conversation about replacement.

How to Lower Your Summer Energy Bills

Cooling is usually the biggest part of a Michigan summer electric bill. A few habits stack the savings: set the thermostat as high as you’re genuinely comfortable with, use fans to stretch each degree, seal gaps around windows and doors, and add shade where you can. Each degree higher on the thermostat saves roughly 1 to 3% on cooling costs — over a full summer, that’s real money.

FAQ

What temperature should I set my AC in summer?

76 to 78°F when you’re home is the common recommendation for balancing comfort and cost. Raise it a few degrees when you’re away, and let fans do the rest.

Is it normal for my AC to run all day in extreme heat?

During a genuine heat wave, yes — a properly sized system may run nearly nonstop to hold the set temperature. What’s not normal is failing to reach the set point on an average summer day, or running constantly with warm air at the vents.

How often should I service my AC in Michigan?

Once a year, ideally in spring before cooling season. Annual maintenance keeps efficiency up, catches wear early, and protects your warranty on most equipment.

Why is my upstairs so much hotter than downstairs?

Heat rises, and most single-thermostat homes struggle with upstairs comfort. Better airflow balancing, a zoning system, or a ductless mini-split for the upper floor usually solves it — we can assess which fits your home.

Need help?

A comfortable Michigan summer comes down to a few basics: a clean filter, a sensible thermostat setting, shade, airflow, and a system that’s been tuned up before the heat arrives. Do those things and your AC will handle almost everything July throws at it. And if it can’t keep up, don’t wait for a breakdown to find out why.

Macklin Heating and Cooling is here to help — whether that’s a seasonal tune-up, a repair, or an honest look at whether your system is up to the job. As a family-owned company serving Genesee County and surrounding communities since 2010, we treat your home like our own.

Call us or Request service online — we’re happy to help.

HVAC Tips for Summer: Keep Cool, Cut Costs, and Avoid Breakdowns