HVAC System Replacement Cost in Mississippi

Full HVAC system replacement in Mississippi costs $8,100 to $17,600 in 2026, though city-to-city prices vary quite a bit. Both heating and cooling get heavy use in Mississippi: its larger communities average 2,275 heating and 2,379 cooling degree days a year.

HVAC System Replacement Prices in Mississippi Cities

City	Estimate	Heating / cooling degree days
Jackson	$7,900 to $17,100	2,123 / 2,522
Gulfport	$8,000 to $17,500	1,507 / 2,748
Southaven	$8,800 to $19,200	2,874 / 2,313
Hattiesburg	$7,800 to $17,000	1,922 / 2,439
Biloxi	$8,500 to $18,500	1,457 / 2,754

From 2020 through 2025, NOAA recorded 283 winter storm and ice events, 1,779 heat events, 83 extreme cold events and 833 hail reports in Mississippi. Those are the days when emergency HVAC calls pile up.

When Replacement Makes Sense

Both the heating and cooling equipment are 15 years old or more
Both units keep needing repairs
Some rooms are uncomfortable, and the energy bills are high
An old R-22 AC paired with an aging furnace

What Moves the Price

Furnace plus AC, or heat pump plus air handler
Efficiency ratings: SEER2, AFUE and HSPF2
Equipment sized to the house and climate
Duct repair or replacement
Thermostat and zoning upgrades
Permits and electrical work

Common Questions

How often should an HVAC system be replaced?

Most systems get replaced every 15 to 20 years. AC units and heat pumps usually wear out before gas furnaces do.

Can I replace only the AC and keep my furnace?

Yes, as long as the indoor coil and blower work with the new AC. A mismatched system loses efficiency and can void the warranty.

Other HVAC Prices in Mississippi

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