Cedar Rapids summers can be brutal. When temperatures climb toward the 100°F mark, your air conditioner works overtime to keep your family comfortable. However, most AC systems are designed to maintain an indoor temperature roughly 20°F cooler than the outside air.
When we hit record-breaking heat, your system needs a little help. Here are some essential tips to keep your AC running efficiently and avoid a mid-summer breakdown.
Set Realistic Thermostat Expectations
If it is 100°F outside, your home will likely hover between 72°F and 78°F. Cranking the thermostat down to 65°F isn’t helping the house get cooler; it’s simply telling the machine never to turn off. This leads to mechanical fatigue, higher energy bills, and a higher likelihood of a “no-cool” emergency call.
Check and Replace Air Filters
Air conditioners don’t actually “create” cold; they remove heat. They do this by blowing warm indoor air over a cold evaporator coil.
The Filter Trap
If your air filter is coated in dust, the blower motor has to work twice as hard to pull air through. This reduced airflow causes the evaporator coil to drop below freezing, turning the condensation on the coil into a block of ice. Once iced over, the system can no longer remove heat, and you’ll feel warm air blowing from your vents. Check your filter monthly during peak summer months.
The Vent Myth
Homeowners often close vents in unused rooms to “save energy.” Do not do this. Modern HVAC systems are designed for a specific volume of air (measured in CFM). Closing vents increases the “static pressure” in your ductwork, which can blow out your blower motor or cause the system to leak refrigerant over time.
Clear the Outdoor Condenser
The outdoor unit is where the heat removed from your house is “dumped” into the outside air. If that unit is dirty or crowded, the heat has nowhere to go.
- Give it Space: Weeds, tall grass, and decorative fences act as barriers. Ensure there is a 3-foot radius of clear space around the unit.
- The Cottonwood Problem: In Iowa, cottonwood seeds and dust act like a blanket on your condenser coils. Every manufacturer recommends having your AC system hose the outdoor fins cleaned and checked annually. Avoid using a power washer, as the high pressure can bend the delicate aluminum fins and permanently restrict airflow. We recommend you call Colony to perform this service to avoid damage to your system.
Block Solar Heat Gain
Windows are the biggest source of heat entry. A south-facing window can let in a massive amount of radiant heat. By closing blackout curtains or high-quality blinds, you can reduce your home’s heat gain by up to 30%, effectively giving your AC a “break” even during the peak of the day.
Limit Indoor Heat Sources
Small habits make a big difference between 2:00 PM and 7:00 PM:
- Cook Outdoors: Avoid using the oven or stove. On a 100°F day, your oven is your AC’s worst enemy. Every BTU of heat your oven puts out is another BTU your air conditioner has to work to remove.
- Delay Chores: Run the dishwasher and dryer at night. Running the dryer and dishwasher adds gallons of water vapor to the air.
- Manage Humidity: Avoid long, hot showers during the heat of the day, as extra humidity makes the air feel much warmer.
Use Ceiling Fans
Fans cool people, not rooms. By using a ceiling fan to create a “wind chill” effect, you can often raise your thermostat by 2–3 degrees without losing any comfort.
Keep Your Vents Open
It’s a myth that closing vents in unused rooms saves energy. Most modern systems are designed for full airflow; closing too many vents increases internal pressure and can strain your system’s components.
Expect Longer Run Times
On a 95°F day, it is perfectly normal for your AC to run almost continuously. Long run times are actually better for your system than frequent “short-cycling” (turning on and off), which consumes more energy and causes more wear and tear.
When to Call for HVAC Service
If you notice any of the following, it’s time to call in the professionals before the system fails completely:
| Symptom | Potential Issue |
| Warm Air from Vents | Low refrigerant or a failed compressor. |
| Ice on Copper Lines | Restricted airflow (check your filter immediately). |
| Steady Temp Rise | The system is overwhelmed or failing; check the outdoor unit. |
| Humming/Buzzing | Could be a failing capacitor or a seized motor. |
By following these tips, you aren’t just staying comfortable—you are protecting a multi-thousand-dollar investment. A little bit of shade, a clean filter, and realistic expectations can be the difference between a cool afternoon and a costly emergency repair. For homeowners in the Cedar Rapids area, call the guys you can trust at Colony Heating and Air Conditioning you’re experiencing system failures.
