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A contractor quoting central AC installation in Martin County has to size the system to the house, not guess at storm damage as the starting condition. 38 severe weather events were recorded in Martin County, Indiana between 2015 and 2024. At that rate, severe weather here is an event, not a constant operating pressure, which means the decisions that shape an install well or poorly are about Manual J load calculations, equipment grade, and how tightly the refrigerant lines and ductwork are sealed. A unit put in carelessly will underperform regardless of what the sky has done.
Ductwork laid down for forced-air heat carries air, but it was sized and routed for a different load than a central cooling system asks of it. Half the homes in Martin County, Indiana were built in 1981 or earlier (2020-2024 ACS 5-year). A contractor quoting an installation in housing this old has to open the supply and return runs and see what is actually there before the equipment can be selected, because a mismatch between the duct configuration and the new unit's airflow requirements shows up as uneven temperatures and short cycling, not as a failed start. The electrical panel gets the same look, since the draw of a modern condenser and air handler has to have a clear path to capacity that older service may not already provide.
What Gets Installed With a New Central AC
The outdoor condenser unit sits outside the house, usually on a concrete pad beside the foundation, and houses the compressor and condenser coil. The indoor air handler or furnace cabinet lives in a basement, utility closet, or attic and holds the evaporator coil along with the blower that moves air through the house.
The refrigerant lines run between those two units, connecting the indoor coil to the outdoor one through a small penetration in the wall or rim joist. A thermostat goes on an interior wall and serves as the control point for the whole system.
The drawing alongside this text shows a typical layout, and a licensed contractor determines exactly what applies to your home.
Find a contractor in Martin CountyMartin County, Indiana, by the numbers
38 severe weather events were recorded in Martin 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 Martin County, Indiana were built in 1981 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesMartin County, Indiana holds 4,583 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 78.5% of the occupied homes in Martin County, Indiana (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesRules & Standards Governing Central AC Installation in Martin 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 Martin County
Weather puts a workload on cooling equipment that specs alone do not capture. How hard a system has to work, and how long it lasts, is shaped by what the local climate actually delivers.
38 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.