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Posted By: tonyI have heard it quoted several times that MHRV is not economic in air leaky houses.
Posted By: davidfreeboroughPosted By: tonyI have heard it quoted several times that MHRV is not economic in air leaky houses.I think this is just based on the calculation that heat recovered by the heat exchanger is small compared to the overall heat lost through infiltration. So the capital cost of the equipment & the running cost of the fans is seen as being wasted.
Posted By: Ed DaviesIt seems to me the possibilities are:1) Leaky house: cheap but with unnecessary losses due to excess ventilation in many circumstances (windy or strong stack effect).2) Airtight house: condensation, mould and, in extreme cases, suffocation.3) Airtight house with MV: right level of ventilation so avoiding losses from excess ventilation.4) Airtight house with MHRV: right level of ventilation with further reduction in losses.
Posted By: tonyyou don't get the cold draughts from trickle vents if they are closed!
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