Editor's pick
WindowENERGY STAR
LG Dual Inverter LW1022IVSM
Cooling
10,000 BTU
Covers
450 ft²
Efficiency
15 CEER
Noise
44 dB
$429 est.
via partner retailers Hot & Humid · ~13¢/kWh · 8-month season
Air conditioning in Mississippi: sizing, costs & the right units
Mississippi has one of the highest AC-penetration rates in America for a reason: Gulf humidity reaches the whole state, and Jackson summers hold heat indexes above 100°F for weeks. Cooling runs April through October.
What to look for in Mississippi
Much of the housing stock is older with single-pane windows and modest insulation — set Insulation to "Poor" in the calculator for pre-1990 homes and expect to size up. Window units dominate here for cost reasons; an inverter model is the meaningful upgrade that pays back on humid nights.
What cooling costs in Mississippi
Estimated at Mississippi's average residential rate (~13¢/kWh, approximate) and 8 hours/day. "Per season" assumes 8 cooling months. Your utility rate and usage will vary.
| Unit | Efficiency | Est. / month | Est. / season |
|---|---|---|---|
| Senville LETO SENL-12CD Mini-split | 21.2 SEER2 | $20 | $160 |
| LG Dual Inverter LW1022IVSM Window | 15 CEER | $21 | $168 |
| BLACK+DECKER BPACT14WT Portable | 6.1 CEER | $72 | $576 |
Climate-matched
All 49 units Units that fit Mississippi's climate
WindowENERGY STAR
Keystone KSTAW12CE
Cooling
12,000 BTU
Covers
550 ft²
Efficiency
12 CEER
Noise
58 dB
$360 est.
via partner retailersMini-splitENERGY STAR
Senville LETO SENL-12CD
Cooling
12,000 BTU
Covers
550 ft²
Efficiency
21.2 SEER2
Noise
28 dB
$799 est.
via partner retailersMississippi AC questions, answered
How do I size an AC for an older Mississippi home?
Older, draftier construction can add 15%+ to the cooling load. In our calculator, select the Hot & Humid zone and "Poor" insulation for pre-1990 homes — a 350 ft² living room that would take 8,000 BTU in new construction often needs 10,000 BTU in older stock.
Are window units still the right call in Mississippi?
For most rooms, yes — they remain the best cooling-per-dollar in a state with long seasons and budget-conscious housing. The upgrade that matters is inverter drive: quieter nights and visibly lower power bills over an 8-month season.
What does AC cost to run in Mississippi?
At ~13¢/kWh, an efficient 12K unit costs roughly $22–30/month at 8 hours/day. Budget fixed-speed units can double that during July–August when compressors run nearly continuously.
Electricity rates are approximate state averages; check your utility bill for your exact rate.