I work with an agency, and we've used Don't Sweat It Air and Heat, Inc. multiple times. If we have a unit that goes down, or we need new installs, they offer same-day service. From duct work, to changing outside or inside units; whatever we need, we've never had an issue with them. The other day we reached out to them, so they came out, and were done in 15 minutes. They've always been great with us, and their prices are very reasonable.