Stephens County, Oklahoma
Heating and AC repair in Duncan, OK
Call and describe the problem, whether the furnace will not light, the heat pump is iced over or the air conditioner is blowing warm air, and you will be connected with an independent HVAC contractor serving Duncan.
Your call is connected to an independent HVAC contractor, subject to availability in your area. HVAC Nation may receive compensation when your call is connected with a participating provider. Providers are independent businesses.
Duncan at a glance
Heating and cooling climate
NOAA's 1991–2020 climate normals for the DUNCAN, OK station show about 3,203 heating degree days and 2,091 cooling degree days in a typical year, with about 69 nights at or below freezing and 76 days reaching 90°F or more. Heating is the bigger load, but summers are warm enough that most homes rely on central air too, so both systems see real use every year.
How homes in Duncan are heated
According to the Census Bureau's American Community Survey, 61% of occupied homes in Duncan heat mainly with utility gas and 36% with electricity. Gas-fired furnaces and boilers are the most common setup, which means igniters, flame sensors, gas valves and venting come up often on heating calls.
Housing age and HVAC systems
The median year built for housing in Duncan is 1972, and about 69% of its 11,106 housing units were built before 1980. Homes from this era commonly have forced-air furnaces with ductwork, and many have had the original furnace and air conditioner replaced at least once.
Services most relevant in Duncan
- Furnace Repair (63% of homes heat with gas, propane or oil)
- Heat Pump Repair (36% of homes heat with electricity)
- AC Repair (about 76 days a year at 90°F or more)
- AC Replacement (median home built in 1972, many systems on their second or third AC)
- HVAC Repair (one call when you are not sure which part failed)
Owners, landlords and tenants
About 68% of occupied homes in Duncan are owner-occupied and 32% are rented. Homeowners, landlords and property managers can call to be connected; tenants should contact their landlord or property manager about heating or cooling problems first.
Nearby places
Duncan is in Stephens County. Places within about 30 miles include Lawton (28 mi), Marlow (10 mi) and Elgin (28 mi).
Other Oklahoma locations
Altus (78 mi), Bartlesville (193 mi), Tahlequah (195 mi), Guymon (250 mi)
Questions
Is HVAC Nation an HVAC company in Duncan?
No. HVAC Nation is a referral service. Calls from Duncan are connected to an independent HVAC contractor, subject to availability in Stephens County.
How do most homes in Duncan heat?
Census survey data shows about 61% of homes heat mainly with utility gas, 36% with electricity, 1% with propane and 0% with fuel oil.
How cold and hot does it get around Duncan?
NOAA normals for the DUNCAN, OK station average about 69 nights a year at or below 32°F and 76 days at 90°F or above.
Is a permit needed to replace a furnace or air conditioner in Duncan?
Many cities and counties require mechanical or electrical permits for equipment replacement. Check with the local building department for Duncan or Stephens County, and ask the contractor.
What should I do if I smell gas?
Leave the home right away without using switches or phones inside, then call the gas utility emergency line or 911 from outside.
Sources: U.S. Census Bureau Vintage 2024 population estimates; American Community Survey 2020–2024 5-year (tables B25040 house heating fuel, B25034, B25035, B25003); 2024 Gazetteer; NOAA NCEI U.S. Climate Normals 1991–2020 (heating and cooling degree days, base 65°F).