Of the 4 bids received ($8900 to $14,000), Comfort Masters was the second lowest but was the most professional. They were the only company to provide a detailed statement of work. For the initial survey, they arrived not just onut "Air Force 1" on time. They presented the quote the next day instead of on the spot like the rest of the companies but the additional detail in the quote was worth the wait. For the installation, they were a little early and finished early. The installers were quick, quiet and they cleaned up after themselves. The price was exactly as quoted with one pleasant surprise. The quote specified a smart thermostat but did not specify a model number. They installed a top of the line thermostat. In addition, they went throughout the house re-sealing the registers as part of the total price. It has been about 6 weeks not and the unit is operating perfectly. A great job. A good company. I am very pleased.