It’s one of the most frustrating things a homeowner can deal with in the middle of a Michigan summer. Your air conditioner is running almost nonstop, the compressor never seems to shut off, and the house still feels muggy and warm. It feels like the system should be working overtime to cool things down, but instead it seems like it’s barely keeping up.
If this sounds familiar, your AC isn’t broken in the way you might think. Something specific is preventing it from doing its job efficiently, and there are a handful of common culprits behind it.
A Dirty Air Filter Is Often the Starting Point
This is the first thing worth checking, and it’s the easiest to fix yourself. A clogged air filter restricts airflow through the entire system. When air can’t move freely, your AC has to work much harder to push cool air through the house, and it often just can’t keep up no matter how long it runs.
Air filters should generally be checked every month during peak cooling season and replaced when they look dirty. If you can’t remember the last time you changed yours, that’s usually a sign it’s overdue.
Low Refrigerant Levels
Refrigerant is what actually absorbs heat from the air inside your home. If your system is low on refrigerant, usually because of a leak somewhere in the line, it simply can’t remove heat the way it’s supposed to. The system will keep running and running because it’s trying to reach the temperature on your thermostat, but it physically doesn’t have enough refrigerant to get there.
This isn’t something you can top off yourself. Low refrigerant means there’s a leak somewhere, and a technician needs to find it, repair it, and then recharge the system properly.
An Undersized System
Sometimes the issue isn’t a malfunction at all. It’s a mismatch. If your AC unit was sized for a smaller home, or if you’ve added square footage since it was installed, the system may simply not have enough capacity to cool your entire space. It will run constantly trying to keep up, and on the hottest days, it just won’t be able to.
This is a common issue in older homes that have had additions built on, or homes where the original system was installed to fit a budget rather than the actual square footage.
Ductwork Problems
Even a perfectly good AC unit can struggle if the air it produces isn’t making it to the rooms it’s supposed to reach. Leaky ducts, poorly sealed connections, or ductwork that runs through unconditioned spaces like an attic can lose a significant amount of cool air before it ever reaches your living room or bedroom.
If certain rooms in your house are noticeably warmer than others, that’s often a strong sign of a ductwork issue rather than a problem with the AC unit itself.
Blocked or Closed Vents
This one is simple but easy to overlook. Furniture, curtains, rugs, or boxes sitting in front of a vent can block airflow into a room without anyone really noticing. If a few rooms in the house have been closed off or partially blocked, it changes the airflow balance for the entire system and can make the whole house feel warmer than it should.
An Aging or Failing Compressor
The compressor is essentially the heart of your AC system. As units age, especially past the 10 to 15 year mark, the compressor can start to lose efficiency. It might still run, but it’s not compressing refrigerant the way it used to, which means it takes longer, and works harder, to produce the same amount of cooling it used to provide easily.
Thermostat Placement or Settings
Sometimes the AC itself is working fine, but the thermostat is getting a false reading. A thermostat placed near a window, in direct sunlight, or close to a heat producing appliance can read the temperature as higher than it actually is, causing the system to run longer than necessary while other parts of the house are already comfortable.
What to Do Next
If your AC has been running constantly and your home still isn’t reaching a comfortable temperature, it’s worth having a technician take a look before the problem gets worse or the system fails completely during the hottest part of the season. A lot of these issues are relatively simple to diagnose once someone is actually looking at the system, the ductwork, and the refrigerant levels together.
How Aspen One Hour Heating & Air Conditioning Can Help
Aspen One Hour Heating & Air Conditioning has been keeping Jackson County homes comfortable since 1981. Our technicians can diagnose exactly why your system is struggling, whether it’s a refrigerant leak, a ductwork issue, or a system that’s simply reached the end of its useful life, and walk you through honest options for getting it fixed.
Comfort Clubhouse members get priority scheduling and no standard diagnostic fees, which makes it easier to get answers fast when something feels off with your cooling system. If you’re not a member, we’re still happy to come take a look.
Call us or visit our contact page to schedule a visit. We serve Jackson County plus Ingham, Eaton, Calhoun, Hillsdale, Lenawee, and Washtenaw counties, and we’re available 24/7 for emergencies.
Frequently Asked Questions
Why does our AC run all day but the house never feels cool?
This usually points to one of a few things, a dirty filter, low refrigerant, an undersized system, or ductwork that’s losing air before it reaches your rooms. A technician can pinpoint exactly which one is affecting your home.
Can we just add more refrigerant ourselves to fix it?
No, and we’d recommend against trying. Low refrigerant almost always means there’s a leak somewhere in the line, so adding more without finding and repairing the leak first just means you’ll be back in the same spot again soon.
How do we know if our AC unit is too small for our house?
If your system runs constantly and still can’t keep up on the hottest days, especially in a home that’s had an addition built on, that’s often a sign the unit doesn’t have enough capacity for the space. One of our techs can evaluate your home and let you know if a larger system makes sense.
Does our thermostat placement actually affect how our AC runs?
It can, more than people expect. A thermostat near a window or in direct sunlight can read the temperature as warmer than it actually is, which causes the system to run longer than it should while other parts of the house are already comfortable.
When does it make more sense to repair versus replace our AC unit?
If your system is more than 10 to 15 years old and the compressor is struggling to keep up, replacement often makes more financial sense than continuing to repair it. Our techs will always walk you through both options honestly so you can decide what’s right for your home.
