Had original 30 yr. old, single slider windows. Couldn't see outside for all of the ice both inside and out and the drafts were incredible!. Patio door handle was broken and ice formed inside due to a lot of use. Dennis the sales rep was very helpful and since I knew what I wanted, he didn't push to sell me anything different. There was a delay with the installation due to the storms we endured (go figure) but they got to me as soon as they possibly could. The installers (Ramesh and his helper) were wonderful! They were on time,very courteous and polite to me as the homeowner. They took great care in cleaning up any mess and covering all carpets and bedding while they were at work. They also braved some icy and windy conditions to get the job done. I would definitely recommend Clera to anyone!