Enhance your home comfort with Keystone's advanced through-the-wall air conditioner, delivering reliable cooling and supplemental heating capabilities with an 8,000 BTU cooling and 4,200 BTU heating capacity. This energy-efficient and quiet AC unit is perfect for spaces up to 350 square feet, offering superior dehumidification of up to 2.1 pints per hour for improved air quality. Designed for easy installation in homes, this modern unit includes a remote control for convenient temperature adjustments and features a built-in thermostat for precise control. With energy-saving modes and a programmable timer, this unit helps reduce electricity costs while maintaining optimal performance. Upgrade to the best through-the-wall AC for your large room cooling needs.