This is the second time we have an HRV system installed. The first time was in a old cottage with single windows. We had lots of condensation on windows and the average temperature in winter was 9 degrees Celsius at the end of the afternoon when we had the HRV representative visiting us. After we had it installed the technician told us it will take about a week to feel the difference. But it didn't take that long at all!!! We could feel and see its benefits the next day! No more wet windows, or cold house. The house instantly felt warmer. And with the tin roof we soon had a free heating system during sunny winter days. I kept saying to my husband "why did it take us soooo long to buy one ?". Soon after that summer the HRV dried the house so well that the doors would fall off their hinges !!!!!. This time we organised an HRV for our new brick double glazed windows house. We waited for winter to see if we would get condensation. And we did ! So HRV was ordered and a date set. I was very impressed again when the technicians arrived right on time to a very difficult address. We gave instructions to the representative when she came but sometimes communication between teams does not happen, therefore my concerns and worries. But this was not necessary!!!!! Technicians were very respectful of our house. It was pouring with rain outside and they brought everything in leaving their shoes each time at the entrance. Then I was impressed with the fact of NO DUST at all....and super quick.... All the job was done in 1 and 1/2 hours. Super efficient, super good service, super good product all around. I will do it again !!!!! Recommended to everyone I know.