Seasons ST12VB1
through-the-wall air conditioner · 12,000 BTU cooling · fits ~600 sq ft
A through-the-wall AC rated 12,000 BTU — enough cooling for a room of roughly 600 square feet (the 20-BTU-per-square-foot rule).
What actually decides this purchase
We publish 91 units at 12,000 BTU. They run within $22 a year of each other — but they sell for $350 to $1,348, a 3.9× spread. Efficiency is not what decides this purchase at 12,000 BTU; price, noise and whether it fits your window are. Here is where this unit lands.
We have no tracked price for this unit, so here is the rule instead. At 12,000 BTU the field runs $350 to $1,348, median $490, and every one of them runs within $22 a year of every other — so price is the decision and efficiency is the tiebreak. On the certified specs we do hold, this one ranks 79th of 91 in its class. If the price you are quoted is above $490, buy something else. Worth comparing against the TCL H12W4KW at $350 and the Friedrich CCV12A10A at 32 dBA for $600.
Price
Not tracked
We have no verified retail listing for this certificate. Units at this size run $350–$1,348.
Noise
Not published
The maker publishes no dBA figure we could verify, and noise is not part of the DOE certification. It is the most common complaint about window units, so treat its absence as a real unknown.
Sleeve opening
Measure first
No trustworthy cabinet width on this certificate, so we will not state a fit range.
Circuit
Standard 115V
Plugs into a normal outlet — no electrician.
We do not have price or noise or sleeve opening for this unit and will not estimate them. Everything above that carries a number is from a certification record or the manufacturer's own published sheet.
Buy this unit
No verified online listing
A through-the-wall AC is a self-install unit: you set it in the window (or wall sleeve), no contractor or refrigerant charge needed. We have not matched a retail listing for this exact model, so we are not linking one. Search your usual retailer for the model number above — and check the certified specs here against whatever you find.
Sized for ~600 sq ft — measure your room and check your window type before you buy.
The Verified Label — every certified spec
certified 2026-05-11
status: Active
Cooling & efficiency — source: ENERGY STAR / DOE
Fit & install — does it fit your window?
Efficiency & running cost — computed by Verified HVAC Data
Worth keeping in proportion: every unit in the 12,000 BTU class runs within $22 a year of every other. The gap between the cheapest and dearest to buy at this size is 46× larger. Efficiency is the smallest number on this page, which is why it is not at the top of it.
Refrigerant & identity
Compare similar room ACs
Frequently asked questions
Is 12,000 BTU right for my room, or should I size up?
About 600 square feet is the guide figure, and 91 certified units sit on that shelf. The next shelf up is 13,000 BTU (5 units), about 650 sq ft. Below it, 11,000 BTU (4 units) covers about 550 sq ft. Between two shelves, take the smaller one: oversizing is the usual reason a unit cools but leaves the room clammy, which our sizing calculator explains.
Does the Seasons ST12VB1 qualify for efficiency rebates?
It meets ENERGY STAR Most Efficient, the top tier some utility rebate programmes require. 20 of the 91 units in its 12,000 BTU class reach that tier, so it is one of several options at this size. Rebates are set by your state and utility, not by the manufacturer — check the programmes for your area.
Does the Seasons ST12VB1 need a wall sleeve?
Yes — through-the-wall units slide into a wall sleeve. This unit measures 24" wide, 15" tall and 21" deep and weighs about 59 lb. Check that your existing sleeve opening matches, or buy the maker's sleeve.
Sources. Certification and CEER from ENERGY STAR room-AC data and the DOE compliance certification database. Cooling capacity, dimensions and refrigerant are the manufacturer-certified values. Annual running cost, suggested room size and the percentile are computed by Verified HVAC Data from published ratings and EIA U.S. average electricity prices — see our methodology. Refrigerant GWP is the IPCC value. We publish no star ratings and take no payment for placement. "Not published" means the source registry doesn't disclose it — we never fill a spec with a guess.