DELLA 048-TL-W10KI
window air conditioner · 10,000 BTU cooling · fits ~500 sq ft
A window AC rated 10,000 BTU — enough cooling for a room of roughly 500 square feet (the 20-BTU-per-square-foot rule).
Buy this unit
$299.96 at Amazon
A window 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 10,000 BTU cooling capacity, the same window 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 ~500 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 500 sq ft — a bedroom, office or apartment — that you install yourself, no contractor.
The standout number
CEER 15 — the room-AC efficiency number; higher means a lower summer electric bill.
The catch
Window units only fit windows in their size range — measure your window width and height against the dimensions below before you buy.
The Verified Label — every certified spec
certified 2024-04-29
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 · ~500 kWh
Efficiency tier
ENERGY STAR certified
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 54%
of the 420 room ACs with a published CEER
Cooling capacity
10,000 BTU
Sized for a room of about 500 sq ft at 20 BTU per square foot.
Rebates & incentives
This unit is ENERGY STAR certified, which a few utility rebates ask for. 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 DELLA 048-TL-W10KI cool?
It puts out 10,000 BTU of cooling. The common rule of thumb is 20 BTU per square foot, so it suits a room of about 500 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 DELLA 048-TL-W10KI?
It is rated CEER 15. 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 38% less energy than the federal minimum for its size.
What does the DELLA 048-TL-W10KI cost to run?
We estimate about $94 a year to run it — roughly 500 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.
Will the DELLA 048-TL-W10KI fit my window?
Measure your window opening first — it needs to be at least 21" wide (the cabinet width), and the unit is about 13" tall and 19" deep, roughly 58 lb. Most double-hung windows fit units in this range with the included side panels, but confirm your window's inside width and minimum height.
Where can I buy the DELLA 048-TL-W10KI?
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.