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Late August through September, and Black Friday is the tail of it. Retailers buy room air conditioners for one season and they don’t want to warehouse what’s left, so the markdowns start as soon as peak heat breaks and run until the floor space goes to heaters. By now the prices are as low as they get, and the only thing you trade is selection. Early spring, roughly March into April, is the runner up: the new model year lands, selection is at its widest, and the discounts are real but shallower. The month you don’t want to be shopping in is July, when a heat wave empties the shelves and nothing has to be discounted to sell.
Air conditioners are unusually forgiving to time, because the product barely changes year to year. Last season’s window unit and this season’s cool the same room the same way, so buying the outgoing model costs you nothing but the model year on the box. Below you’ll find live AC deals sorted by type, the month by month calendar we go by, and the sizing math that matters more than any discount does.
Air Conditioner Deals On Sale
Every one of these is discounted, cheapest first.
The Month by Month Air Conditioner Calendar
What we see year after year tracking room AC pricing. The highlighted rows are the two windows worth planning around.
| When | What Happens | Verdict |
|---|---|---|
| January to February | Heaters own the floor space and AC stock is whatever survived last fall. Prices are low because nobody is shopping, but you take what’s there. | Cheap, no selection |
| March to April | The new model year lands and retailers promote early to get units moving. The widest selection of the year, with honest but modest discounts. | Best for selection |
| May | The first warm week pulls buyers in and promo pricing tightens. Still workable if you move early in the month rather than late. | Getting worse |
| June to July | Peak demand. A heat wave clears the shelves in a weekend, delivery windows stretch, and nothing needs a discount to sell itself. | The worst time |
| Late August to September | Retailers clear cooling stock to make room for heating. The deepest cuts of the year, and this is where the window starts. | Best for price |
| October to December, Black Friday included | Whatever survived clearance goes cheap, and this is the last real markdown of the year. Most stores have moved on to heaters, so buy what is in stock rather than holding out for a model. | Cheap if you find it |
What Actually Counts as a Good AC Deal
A cheap air conditioner that’s wrong for the room is the most expensive thing on this page. Before the price, check these:
- BTU matched to the room, not the biggest number you can afford. An oversized unit cools fast, shuts off, and leaves the air clammy, because it never runs long enough to pull the humidity out. Around 20 BTU per square foot is the starting point.
- A CEER rating in the low teens or better. That’s the efficiency figure that decides your summer electric bill, and it’s the main thing separating two window units that look identical on the shelf.
- An inverter compressor if you’ll run it all season. It costs more up front, and it’s the single biggest difference in both noise and running cost.
- Energy Star certification. It also unlocks utility rebates in a lot of states, so check your power company’s site before you buy. The rebate sometimes beats the sale.
- A brand you can get parts for. Frigidaire, GE, LG, Midea and Friedrich all have service networks behind them. An unbranded listing with a model number nobody recognizes gives you neither.
Where to Shop Air Conditioners
Amazon isn’t the only place worth checking, and on appliances it often isn’t the cheapest. These four are the ones we actually compare against, and each is genuinely stocked.
How to Pick the Right Air Conditioner
You’re cooling one bedroom. A 5,000 to 6,000 BTU window unit handles up to roughly 250 square feet, and going bigger makes the room clammy rather than colder.
Nothing can go in the window. Portable is the answer, but budget one size up and expect a higher bill, because the exhaust hose gives back some of the cooling you paid for.
You’ll run it all summer, every summer. An inverter window unit or a mini split earns back the extra cost in running savings, and it’s the difference between a room you can sleep in and one you can’t.
You rent. Read the lease first. Plenty of buildings ban window units outright, and that restriction is the main reason a portable is worth its compromises.
You’re shopping mainly on price. Wait for the clearance rather than switching models. The same unit swings further between August and October than it does between two competing brands.
Best Time to Buy an Air Conditioner FAQ
The Bottom Line
Air conditioners follow the calendar more predictably than almost anything else we track, and the calendar says. Prices bottom out from late August through September as retailers clear cooling stock for heating stock, and Black Friday weekend is where that starts. Spring is the better window if selection matters more than price, and June and July are the two months to avoid entirely. Get the size right before you get excited about the discount, because a unit that’s too big for the room will annoy you every summer no matter what you paid for it.
