Air Current Inc. comes out and does monthly regular service for us. We've been using them for almost 12 years and they've never had any problems. As a business owner this is huge for us - we have enough to worry about without having hangups maintaining our property so I am glad I can rely on Air Current Inc. When I call them they usually come right out and even when there are different technicians they are reliable, do great work, and clean up after the job. We've had units replaced and duct work done and their service is excellent.