Energy & Efficiency
Why is my energy bill so high?
The usual suspects behind a high bill in a Des Moines home — and how to tell a normal seasonal bump from a system that’s quietly costing you money.
A high energy bill almost always traces back to run time: anything that makes your furnace or AC run longer costs more. The common causes are a strained system (a dirty filter, dirty coil, or low refrigerant), an aging low-efficiency unit, leaky ducts and thin insulation, thermostat habits, and Iowa’s weather extremes. Start with the filter, compare your usage to the same month last year, and book a tune-up if the jump doesn’t match the weather.
What drives a high bill
- A system working harder than it should. A clogged filter, dirty coil, or low refrigerant forces your furnace or AC to run longer to hit the same temperature. Longer run times show up directly on the bill.
- An aging or low-efficiency system. An older furnace or AC simply converts less of the energy it uses into comfort. As efficiency tiers (AFUE and SEER2) have climbed, a 15-year-old unit can cost noticeably more to run than a modern one.
- Leaky ducts and thin insulation. Ductwork that leaks into the attic or crawlspace throws away air you paid to heat or cool. Combined with weak insulation, it's one of the biggest hidden drivers of a high bill.
- Thermostat habits. Big temperature swings, holding an extreme setting, or a thermostat placed near a heat source all make the system run more than it needs to.
- Iowa's weather extremes. A long humid stretch in summer or a deep cold snap in winter means the system runs nearly nonstop. Some seasonal increase is normal — a sudden jump that doesn't match the weather is the red flag.
What to check first
- 1 Change the filter. A dirty filter is the most common, cheapest fix. Swap it and watch the next week.
- 2 Compare to the same month last year. Look at usage, not just dollars — rates change. A big jump in actual energy used points to the system, not the utility.
- 3 Listen and feel. Rooms that never get comfortable, a system that never seems to shut off, or new noises all suggest the equipment is struggling.
- 4 Book a tune-up. A technician can measure efficiency, check refrigerant and airflow, and spot duct leaks you can't see.
Comfort settings matter too — our guide to the best thermostat settings for Iowa can shave run time, and if you’re weighing an upgrade, what SEER2 means explains how efficiency tiers affect what you pay each month.
Iowa myth vs. truth
Myth: “High bills in an Iowa summer or winter are just unavoidable.”
Some increase is normal when the weather is extreme — but a bill that climbs far faster than your neighbors’, or jumps without a matching cold snap or heat wave, is almost always a fixable problem. A strained or oversized system, leaky ducts, or a unit past its prime can quietly add to every bill until someone measures it.
Find the leak in your bill
Bills climbing in your Des Moines home?
A tune-up lets a technician measure efficiency, check refrigerant and airflow, and spot duct leaks you can’t see — the things that quietly raise a bill. All Seasons HVAC serves the Des Moines metro and can pinpoint what’s driving yours.
Common questions
Why is my energy bill higher in summer?
During a humid Iowa summer your AC runs far longer to pull heat and moisture out of the house, so it uses more electricity. A bigger-than-expected jump usually means a dirty filter or coil, low refrigerant, or leaky ducts making the system work harder than the weather alone requires.
Can a dirty air filter raise my energy bill?
Yes. A clogged filter chokes airflow, so the system runs longer to reach the set temperature and can even freeze the coil. Changing the filter is the cheapest first step when a bill spikes.
Will a smart thermostat actually lower my bill?
It can, mostly by trimming run time when you're asleep or away. It helps most when paired with a healthy, properly sized system — it can't fix leaky ducts, low refrigerant, or worn-out equipment.
When does a high bill mean I need a new system?
When the bill keeps climbing year over year, the system is past its average service life, and repairs are stacking up. At that point an efficiency upgrade often pays back part of its cost in lower monthly bills — our repair-or-replace calculator helps you weigh it.