We noticed an instant difference after the system was installed. We were used to waking up and opening our bedroom curtains to our windows being covered in condensation and we have not seen one drop since the installation. Havent had any problems with it so far and it was installed in February so fingers crossed. I also found that the house seemed to heat up easier when we had the heating on since it has been installed. My only thing is that I wish it would reach down to the kitchen/extension because we get condensation in there but we were told it probably would t and our worst areas were bedrooms and the bathroom so still worth it in my eyes.