the service was terrible, phone calls were never returned. We paid in full before work was done and then got screwed over waitting for workers to show up. Had to call in another company to do air returns so drywallers could continue their work. Our home was delayed significantly resulting in our stay at hotel. Would never ever hire them again. We got a Coleman furnace and am thinking of contacting them directly because some rooms in home are very cold and even though I have called great lakes no-one has even come by to check this issue.