Walmart offers the Arctic King 12,000-BTU Through-the-Wall Air Conditioner / Heater in White for $259. Choose in-store pickup to cut that to $254.18. That’s the lowest price we could find by $5. It’s designed for rooms up to 550 square feet and features:

• 3 fan speeds
• washable air filter
• 24-hour on/off timer
• remote control
• vertical-opening window installation kit