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HVAC Replacement Cost in Mississippi (2026)

HVAC replacement in Mississippi typically runs $6,900–$15,500 for a complete 3-ton system replacement, with natural-gas furnaces with central AC as the dominant heating choice and roughly 2,300 heating degree days against 2,700 cooling degree days driving the seasonal load mix. Mississippi Delta and Gulf Coast humidity (dewpoints over 75°F from May through October) makes oversized AC the dominant install error — short-cycling units fail to dehumidify, leaving indoor RH above 60% with chronic mold risk; Manual-J load calcs that override square-footage rules of thumb are essential for any new construction.

State Mississippi
Cities Covered 6
Typical complete 3-ton system replacement $6,900 – $15,500
BLS HVAC mechanic wage $22.41/hr

Mississippi climate & load drivers

  • IECC climate zone: 2A-3A
  • Annual load split: Cooling-dominant — annual cooling load exceeds heating load (2,300 HDD / 2,700 CDD)
  • Dominant heating fuel: Natural gas — piped utility supply through state pipeline network
  • Dominant cooling system: Air-source heat pump providing both heating and cooling

Mississippi licensing & permits

  • License status: Statewide registration required (no exam)
  • License board: Mississippi State Board of Contractors — Commercial Mechanical license over $50,000; residential largely municipal (official site)
  • Permit: city or county mechanical permit required

How HVAC replacement costs vary in Mississippi

State-specific code or insurance rule: Mississippi Code §31-3-15 sets one of the highest commercial mechanical licensing thresholds in the country at $50,000 — below that level, a registered general contractor with EPA 608 cert can install residential HVAC, while jobs above require a state-licensed Mechanical Contractor with $50K bond and exam.

Cities in Mississippi

Compare HVAC replacement pricing for 6 cities across Mississippi.

Biloxi, MS

Compare local HVAC replacement pricing in Biloxi.

Gulfport, MS

Compare local HVAC replacement pricing in Gulfport.

Hattiesburg, MS

Compare local HVAC replacement pricing in Hattiesburg.

Jackson, MS

Compare local HVAC replacement pricing in Jackson.

Meridian, MS

Compare local HVAC replacement pricing in Meridian.

Southaven, MS

Compare local HVAC replacement pricing in Southaven.

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More state guides

Pricing ranges reflect Mississippi market labor (BLS OEWS HVAC mechanic mean $22.41/hr) and Woogoro regional cost modeling. For the most localized estimate, see your nearest city page above.