47% of Oklahoma City’s 306,366 housing units predate 1980, which in practice means first-generation central air past end of life, and R-22 systems that cost more to recharge than replace. Heating runs 57% utility gas to 40% electric. Housing value sits at $231,300 against 306,366 units, which sets what a repair-or-replace decision looks like here.

What we get called for in Oklahoma City

Rust or soot streaks at the furnace heat exchanger

A cracked heat exchanger can put carbon monoxide into the supply air. Do not run the furnace. If anyone in the house has headaches or nausea that improve when they leave, treat it as an emergency – get everyone outside and call 911 or your gas utility from outside the building. Have the exchanger inspected before the system runs again.

Ducts in an unconditioned attic

Standard for this era and the single largest efficiency loss in most Oklahoma houses. Attic temperatures run well past 130 degrees in July, and mastic that has dried and cracked leaks cooled air straight into it. Sealing the duct usually returns more than upgrading the equipment.

Condenser pad has sunk and the unit leans

Slab-mounted units settle over decades. A significant tilt puts the compressor out of level and strains the line set. Re-levelling is inexpensive; a compressor is not.

R-22 system leaking refrigerant

Production of R-22 ended in 2020. What is left is reclaimed stock at several times the old price, so a recharge on a leaking system can cost a meaningful fraction of replacement and buys one season. Get the leak located before you decide – a coil leak and a line-set leak are different conversations.

What this costs here

Filter change	$0 – do it yourself
Coil rinse	$0 – do it yourself
Capacitor replacement	$195-345
Condensate line clear	$160-275
Duct sealing, whole house	$2,000-3,900
AC replacement, 3 ton	$7,000-11,500

Ranges reflect Oklahoma City-area labor against a $231,300 median. Two of these you can do yourself for nothing.

Check these first

• Kill power at the outdoor disconnect and rinse the condenser coil from the inside out with a garden hose. Never a pressure washer.
• Find the condensate cleanout near the air handler and clear it with a wet vac before it backs up into the ceiling.
• Check that no supply register is blowing directly across the thermostat, and that the thermostat is not in afternoon sun.

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Written by Jaylan Jones. Sooner Home Services earns a referral fee when a call connects to a contractor. See our business-model disclosure.