Wallmaster WCVT12B30B
through-the-wall air conditioner · 11,800 BTU cooling · fits ~590 sq ft
A through-the-wall AC rated 11,800 BTU — enough cooling for a room of roughly 590 square feet (the 20-BTU-per-square-foot rule).
Buy this unit
$1,348.00 at Amazon
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 verified this listing against the certified record: same brand, the same 11,800 BTU cooling capacity, the same through-the-wall AC form factor, and in stock at the price shown. Its title doesn’t carry this model number, so treat it as the current equivalent rather than a guaranteed identical SKU.
Sized for ~590 sq ft — measure your room and check your window type before you buy.
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At a glance
Who it's for
Cooling a single room of about 590 sq ft — a bedroom, office or apartment — that you install yourself, no contractor.
The standout number
CEER 13.9 — the room-AC efficiency number; higher means a lower summer electric bill.
The catch
A through-the-wall unit needs a wall sleeve (buy the matching sleeve if you don't already have one) — check the opening size before you order.
The Verified Label — every certified spec
certified 2026-06-17
status: Active
Cooling & efficiency — source: ENERGY STAR / DOE
Fit & install — does it fit your window?
Operating cost — computed by Verified HVAC Data
Estimated annual running cost
per year at U.S. average electricity prices · ~637 kWh
≈ $6/yr more than the average unit this size
Efficiency tier
ENERGY STAR Most Efficient — top tier
Running cost falls as CEER rises and as you run it fewer hours. Your climate and local electricity price change the total.
Refrigerant & identity
How it ranks
Where this unit sits among the 420 window and through-the-wall air conditioners we track, on CEER — the efficiency number that decides its running cost. Percentiles are computed from our corpus (higher = better).
CEER efficiency
Better than 16%
of the 420 room ACs with a published CEER
Cooling capacity
11,800 BTU
Sized for a room of about 590 sq ft at 20 BTU per square foot.
Rebates & incentives
This unit meets ENERGY STAR Most Efficient, the top room-AC tier some utility rebates require. The federal 25C credit expired December 31, 2025, and it never covered room ACs anyway; the live money is state and utility programs. Check what applies where you live on our rebates page.
Compare similar room ACs
Frequently asked questions
What size room does the Wallmaster WCVT12B30B cool?
It puts out 11,800 BTU of cooling. The common rule of thumb is 20 BTU per square foot, so it suits a room of about 590 square feet with 8-foot ceilings. Sunny rooms, kitchens or spaces with many people need a bit more; heavily shaded rooms a bit less.
How efficient is the Wallmaster WCVT12B30B?
It is rated CEER 13.9. CEER (Combined Energy Efficiency Ratio) is the DOE test number for room air conditioners — the higher it is, the less electricity the unit uses for the same cooling. This model uses about 46% less energy than the federal minimum for its size.
What does the Wallmaster WCVT12B30B cost to run?
We estimate about $120 a year to run it — roughly 637 kWh, at U.S. average electricity prices and a typical cooling season. Your climate and local power price move the number; running it fewer hours costs less.
Does the Wallmaster WCVT12B30B need a wall sleeve?
Yes — through-the-wall units slide into a wall sleeve. This unit measures 27" wide, 16" tall and 21" deep and weighs about 110 lb. Check that your existing sleeve opening matches, or buy the maker's sleeve.
Where can I buy the Wallmaster WCVT12B30B?
Room air conditioners are self-install and sold online. Our "Find it on Amazon" button opens a live search for this exact brand and model so you can compare current prices and sellers. It sets in the window (or wall sleeve) yourself — no contractor and no refrigerant charge.
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.