I built two detached ECO houses.We fitted MVHR in both dwelling. I had the system priced up by a number of companies. Solarcrest were the most expensive by around 20% (the extra expense due to the superior design service provided) o save money I decided to use one of the other firms (who I discovered didn't really know what they were doing) Solarcrest helped me sort out the mess that the other business had created. To cut a long story short I wish I'd used Solar Crest from the onset. My advice is pay the extra cost because they know what they're talking about! Mark. A house developer, project manager and architectural designer based in Holmfirth.