Under the Greenon windows contractor program I located Hartmann windows. Of the 3 suppliers I had come to the house, Greg’s explanation of window technology and a competitive quote left the other 2 quotes in the dust. He & his crew installed the windows in only 2 days. The installations were were prompt, clean, and professionally done. The triple glazed windows look great, operate smoothly, and with the reflective coatings keep the house cooler on hot days. Greg then assisted in the submission of the rebate documents for the Greenon program. I am pleased I chose Hartmann Windows, a local supplier who did top notch work. I have no hesitation in recommending Greg and his crew.