The heat exchanger went in my Carrier furnace this winter. Called around and had four in home assessment quotes. Decided to go with Button's heating and air conditioning. He didn't try to over sell me like the other companies did. Very knowledgeable, they have been around for 40 plus years. I went with a Daikin 100000 BTU 2 stage M/S that came with 12 year parts and labour warranty. Upgraded from a 1" to 5" filter. They came on time. I was really impressed with the installation, the clean up. Really professional. I have a 3600 square foot home and the new furnace takes the heat comfort to a whole new level. Runs quieter and takes a lot less run time to reach desired temperature. I'm a Happy customer and would highly recommend them.