AC Replacement in Des Moines, IA

When Replacement May Be Considered

Replacement enters the conversation when one or more of these are true: the system is roughly 12–15+ years old, a major component (compressor, coil) has failed, repairs are becoming a yearly ritual, the system still uses phased-out R-22 refrigerant, or cooling bills keep climbing while comfort keeps dropping. None of these alone forces the decision; together they usually make the math clear.

Repair vs. Replacement

The decision depends on system condition, repair scope, equipment age, efficiency, replacement cost, parts availability, and a professional assessment of your specific unit. A common informal check: if the repair cost multiplied by the system's age in years exceeds the cost of a new unit, replacement usually deserves a serious look. Treat that as a conversation starter, not a rule. The full breakdown is in AC repair vs. AC replacement.

System Sizing: Bigger Is Not Better

Proper sizing comes from a load calculation (often called a Manual J calculation) that accounts for your home's square footage, insulation, windows, orientation, and ductwork. An oversized system short cycles: it cools the air fast, shuts off before it dehumidifies, and leaves the house cold and clammy while wearing itself out. An undersized system runs constantly and never catches up on the hottest days. Ask every bidding contractor how they determined the size they are proposing. "Same size as the old one" is only acceptable if the old one was sized correctly in the first place.

Efficiency Considerations

Air conditioner efficiency is expressed as SEER2 (Seasonal Energy Efficiency Ratio, updated testing standard). Higher SEER2 equipment costs more up front and uses less electricity per unit of cooling. Whether the premium pays back depends on your usage, electric rates, and how long you will own the home, and no website can promise you savings. What matters universally: even the most efficient equipment underperforms if it is installed poorly or paired with leaky ducts.

Installation Considerations

• Equipment compatibility: the outdoor unit, indoor coil, and furnace or air handler must be matched. Mixing mismatched components can cut efficiency and void warranties.
• Refrigerant line set: existing lines may need flushing or replacement, especially when changing refrigerant types.
• Ductwork: leaks and undersized returns undermine new equipment; ask whether a duct inspection is part of the quote.
• Electrical: newer equipment sometimes needs circuit or disconnect updates.
• Permits: ask the contractor whether the work requires a permit in Des Moines and who pulls it.

Questions to Ask Bidding Contractors

• How did you size this system? Can I see the load calculation?
• Is the indoor coil matched to the outdoor unit, and is the combination listed in AHRI's directory?
• What exactly is included: line set, pad, disconnect, thermostat, duct modifications, permits?
• What are the equipment warranty and your labor warranty, in writing?
• Can you provide proof of licensing and insurance?

Get at least two written quotes for a replacement. Prices vary legitimately with equipment, scope, and contractor, and this site does not publish invented price ranges. The questions to ask an HVAC contractor article has a longer checklist.

Frequently Asked Questions

Related: AC repair · HVAC replacement · Furnace replacement