We have done a self-build from the foundations up. Having lived in a caravan during the build we opted to insulate it well beyond regulations whenever we had a choice. Esentially, the house is a Celotex box without a single wall opening or glazing triple vent. MVHR was an obvious choice. Despite being mediocre DIY people we opted to install it ourselves. We sent plans to Solarcrest and they came up with a full plan for where piping should go and all the necessary parts. We were forced by external factors to change room layouts a few times and each time they were happy to change the design. Answers to all queries were within hours, often minutes During installation we had queries about how parts should go together and, with the help of some photos were guided through anything we didn't understand. When extra parts were needed the were invoiced and dispatched immediately. The end result ? For the last 2 months, including hideous January 2017, we have been running the Heat Recovery system without a single problem from the instant it started. It makes no noise and we occasionally put our hands to the inlet to make sure it is actually working. It always is. We had to turn it off for a couple of days due to other electrical work and you could quickly tell the difference in air quality. One can get used to a good thing very quickly It is often helpful to say "what could be done better". We do not have an attic space so chose to place the unit and manifolds in the ceiling void. Placing it in an attic (even a small purpose built one) would make the installation easier. The kit is serious stuff for a DIYer . It requires firm manipulation and even firmer attachment to the manifolds. The output from grey Plenums is the same width as the widest hole cutter which makes cutting a hole for them awkward and time consuming. A problem for the Plenum designer, not Solarcrest, to address. But the conclusion is simple from one self-builder with no construction industry connections or skills. If you are building a house in the UK, especially the south, seal it up, put in MVHR and buy everything from Solarcrest. MVHR really is all they promise and Solarcrest will make sure you get the right kit