As regards the useful advice given by lowc02design, I would only question the viability of MVHR if you are not planning to make the house really, really airtight.
MVHR and/or heat pumps require a super insulated, air-tight building envelope to be even remotely efficient. ....
as regards MVHR - you could allow for its ducting and install, but hold off on the final decision until works are far enough advanced to carry out a air-tightness test. If the resulting air-leakage figures are high, perhaps a positive input or demand controlled system could be installed instead of a heat recovery system
this makes no sense? surely the existing house will not be separate from the new extension?thanks threebedsemi, i'm thinking alright we'll have to extend to get air tightness if we plan to put in MVHR to be effective
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