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Sizing a central AC system for a Delaware County home is a local calculation, not a catalog one. 88 severe weather events were recorded in Delaware County, Indiana between 2015 and 2024. At that rate, severe weather is a standing condition of operation here, and a contractor who ignores it when selecting equipment or specifying the install will undersize the system for what it will actually face. Refrigerant line routing, unit placement, and equipment ratings all get set once at installation, and those choices carry the load every season after.
Ductwork laid down for equipment of an earlier era was designed around what that equipment asked of it, and a new central AC unit asks something different. Half the homes in Delaware County, Indiana were built in 1967 or earlier (2020-2024 ACS 5-year). That spread across the housing stock means a contractor pulling permits for a new installation here regularly opens walls or crawl spaces to check what the existing runs will actually carry before anything else gets priced. Electrical service follows the same logic: a panel wired before modern load expectations were standard gets evaluated against what the new unit draws. The equipment choice comes after those answers.
What Gets Installed With a New Central AC
The outdoor unit sits on a pad beside the house and holds the compressor and condenser coil. Inside, the air handler or furnace-mounted evaporator coil lives in a utility space, basement, or attic. Together these two units are the physical core of what a contractor sets in place.
The refrigerant line set runs between the two units, carrying the working fluid that ties the indoor and outdoor sides together. A thermostat goes on a main living-area wall and gives the homeowner control over the whole system.
The drawing shows a typical layout, and a licensed contractor determines exactly how these pieces fit the configuration of your home.
Find a contractor in Delaware CountyDelaware County, Indiana, by the numbers
88 severe weather events were recorded in Delaware County, Indiana between 2015 and 2024.
NOAA National Centers for Environmental Information, Storm Events Database, bulk CSV export, events 2015-01-01 through 2024-12-31.Half the homes in Delaware County, Indiana were built in 1967 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesDelaware County, Indiana holds 51,635 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 66.5% of the occupied homes in Delaware County, Indiana (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesRules & Standards for Central AC Installation in Delaware County, Indiana8 sourced rules and standards
What the Installation Actually Looks Like
Split-system central air conditioners rated below 45,000 Btu/h manufactured on or after January 1, 2023 must meet a federal minimum of 13.4 SEER2.
Split-system central air conditioners rated at or above 45,000 Btu/h manufactured on or after January 1, 2023 must meet a federal minimum of 13.4 SEER2.
Split-system central air conditioners manufactured between January 1, 2015 and December 31, 2022 had to meet 13 SEER, the metric that preceded SEER2.
Single-package central air conditioners manufactured on or after January 1, 2023 must meet a federal minimum of 13.4 SEER2.
Space-constrained central air conditioners manufactured on or after January 1, 2023 must meet a federal minimum of 11.7 SEER2.
Federal efficiency standards for split-system central air conditioners and heat pumps are set on each certified combination of outdoor unit and indoor coil rather than on the outdoor unit alone.
Residential and light commercial air conditioning and heat pump systems assembled in the field, including mini-splits and unitary systems, may not be installed on or after January 1, 2025 using a refrigerant with a global warming potential above 700.
A field-assembled system whose specified components were all manufactured or imported before January 1, 2025 carries no installation compliance date under the refrigerant restrictions and may still be installed.
Severe Weather Events in Delaware County
Local weather puts real strain on cooling equipment, and how hard a system has to work over its life is a local fact, not a national average. What happens in Delaware County shapes what a central AC installation here needs to handle.
88 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.