Sig Cox Heating And Air Conditioning installed two separate air conditioning and heating units for me. One was a three ton unit, and the other was a four ton unit. The installation crew was very friendly and professional, and they worked diligently to get the installation done. The three ton unit had a problem, and had to be replaced within a few days. They stood behind their work, and they replaced the unit quickly! Everything is now working great, and I am very satisfied with them!