Discount Air Conditioner Deals

At eBay, get this Keystone 26" Wall Sleeve for Through-the-Wall Air Conditioners for $24. It's the best price we could find by $60. It's an open-box unit designed to be fastened securely into a wall opening, including pre-cast concrete or masonry walls, before a through-the-wall air conditioner is installed. Buy Now at eBay

At eBay, get the refurb Hisense 8,000-BTU DOE Smart Portable Air Conditioner for $200. It's the best price we could find for a refurb by $30. A 2-year Allstate warranty is included. Buy Now at eBay

A compact wall-mounted air cooler that suits small rooms or workspaces where you want to free up floor space, it's $99 less than Amazon is charging for a similar one. Import charges of $19.87 and a payment processing fee of $2.08 apply.

New Alibaba customers get shipping for $6.66; otherwise, it starts at around $27.  Buy Now at Alibaba

The Home Depot carries a wide range of portable air conditioners covering small bedrooms up to large open spaces over 700 sq. ft. Prices start around $221 for compact units and climb toward $680 for larger, feature-packed models with heating and dehumidifying functions. Several units are discounted, including one Edendirect model at $449.61, down 41% from $762.04. Shoppers can filter by room size, BTU rating, and features like built-in heaters or dehumidifiers to match a unit to their space. Shop Now at Home Depot

This 12,000-BTU mini split system is $391.49 at Walmart.  That's a $59 low.  Shipping is free. Buy Now at Walmart

Worth stocking up on if you're managing allergies at home, since MERV 11 catches finer particles like pet dander and pollen without straining most standard HVAC systems, and having six on hand means you won't need to reorder for a while. Buy Now at Home Depot

Sizing up your HVAC's next filter change is easy when you've got four on hand, and MERV 11 strikes a solid balance for catching dust, pollen, and pet dander without straining your system's airflow. Anyone with allergies or pets at home will notice the difference over standard fiberglass filters. Buy Now at Home Depot

Anyone dealing with seasonal allergies or pet dander will want the MERV 11 rating here, since it captures smaller particles than a basic filter without choking off airflow like the highest-rated options can. The 6-pack covers roughly a year of monthly changes, so you're not restocking every couple months. Buy Now at Home Depot

Update: The price has changed to $396.62 since this was originally published.

The U-shaped design lets you close your window on top of the unit instead of around it, which cuts down on outside noise and gaps compared to standard window units, making it a solid pick if your bedroom window faces a busy street. It's $70 off the $450 list price at Amazon. Buy Now at Amazon

Keeping the exhaust hose covered helps block heat transfer and condensation drips, which matters if your portable AC sits in a finished room rather than a garage or basement. It's $4.71 (about 19%) off the $24.70 list price. Buy Now at Amazon

Replacing a faulty control board is often cheaper and faster than calling in a technician, and this EC09117 board is a straightforward fix for anyone whose AC unit is unresponsive or stuck on the wrong settings. It's a practical option for DIYers comfortable with basic appliance repair who want to avoid a full system replacement. Buy Now at Newegg

Keeping your evaporative cooler running efficiently comes down to swapping in fresh media when airflow and cooling drop off, and this replacement set for the Cyclone 130 is $9.34 off the $118.29 list price. Buy Now at Amazon

Homeowners dealing with dust or pet allergies will notice the difference with MERV 11's tighter filtration, and having three on hand means you're covered for multiple replacement cycles without reordering. Buy Now at Home Depot

Swapping filters every month or two is the simplest way to keep your HVAC system running efficiently, and this 2-pack covers you for a while without another trip to Home Depot. Buy Now at Home Depot

Folks managing nonstandard furnace sizes know how hard these filters can be to track down, and having three on hand means you're covered for a while without reordering. Buy Now at Home Depot

Handy for anyone whose AC unit sits exposed to rain, leaves, or snow, since covering it in the off season cuts down on debris buildup and corrosion. It's $2.64 off the usual $13.88 price at Walmart. Buy Now at Walmart

Anyone with a furnace system sized for this non-standard 13" x 20" x 4" slot will want to keep a couple on hand, since MERV 8 filters catch everyday dust and pollen without restricting airflow the way higher-rated filters can. The 2-pack means you're not reordering every month if you're on a standard 90-day replacement schedule. Buy Now at Home Depot

Update: The price has dropped to $419.99 since this was originally published.

The U-shaped design lets you close your window on top of the unit for less noise and better insulation, making it a solid pick for bedrooms or anyone tired of traditional AC rattle. Smart controls let you run it from your phone, and it's currently $77 off the $510 list price at $433. Buy Now at Amazon

Homes with pets or allergy sufferers will notice the difference with a MERV 11 rating, which catches finer particles than the standard MERV 8 filters most HVAC systems ship with, and the 2-pack means you're not reordering again in a month. Buy Now at Home Depot