A condensate drain line is the PVC or flexible hose that carries water away from your Indoor Air Handler. As the AC cools your home, it removes humidity from the air, which turns into water. This water must be drained safely outside or to a household drain. We provide high-quality drain hoses in our Installation Kits. If the line becomes clogged, it can lead to leaks and water damage, which is why Preventive Maintenance is so important. For units mounted on interior walls, you may need a Condensate Pump. Proper installation of the drain line is a key requirement for your Warranty Policy. It’s a simple but vital part of your Heat Pump System.