Discount Air Conditioner Deals

Cooling and heating one room without ductwork, this 18,000 BTU unit suits larger bedrooms or small apartments where central air isn't an option. At $680, it's $120 off the $800 list price via coupon code "BS0SQGSM". Deal ends October 31.  Buy Now at Amazon

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

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

Swapping filters every month or two is easier when you've already got a 5-pack on hand, and MERV 8 covers standard household dust and allergen filtering without restricting airflow. Home Depot has this size in stock if your system calls for 17" x 20" x 2". Buy Now at Home Depot

Your HVAC system takes this odd 18" x 30" x 4" size, and having four on hand means you can swap filters every few months without scrambling to find a replacement. MERV 8 handles everyday dust and pollen, making it a reasonable fit for most households without restricting airflow. 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

Keeping a spare on hand saves you from an AC repair call when the control board fails, especially if your unit's original is hard to source locally. It's a straightforward swap for anyone comfortable with basic appliance repair rather than hiring an HVAC tech. Buy Now at Newegg

Anyone in a dry climate looking to cool a larger home without the electric bill a central AC unit brings should take a look at this, since evaporative coolers pull in fresh outside air instead of recirculating it. The down-draft design and 3,800 CFM output suit whole-house setups rather than single rooms. Buy Now at Home Depot

Anyone installing a ductless mini split unit will want a bracket rated for the actual weight of the condenser, and this one handles up to 490 pounds so you don't have to guess about load limits. Buy Now at Home Depot

Keeping a spare motherboard on hand makes sense if your AC's compressor control board fails and you're trying to avoid a full service call, especially once the unit is out of warranty and parts get harder to source. Newegg carries this specific model, which helps if you've already confirmed it matches your external unit's specs. Buy Now at Newegg