I wanted to update my review as it seems appropriate given the fact it's been extremely hot lately. Boyd said the blinds would lower our utility cost. My wife and I had a son last fall. I lost control of the thermostat last fall. Our air conditioner or heat has been on since our son was born and we haven't had an electric bill within $130 of our bills last year. I know this will be different for everyone as we have older windows so we probably lost or gained heat more than most. But it amazes me the value of these blinds. Thanks again Boyd.