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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

PLEASE NOTE: A download link for Volume 1 will be sent to you by email and Volume 2 will be sent to you by post as a book.

Buy individually or both books together. Delivery is free!


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    • CommentAuthorFieldfare
    • CommentTimeFeb 9th 2019 edited
     
    Hi all- just looking into the pros. and cons of each. 1/3 of our house is a 2-up- 2 down cottage with bathroom and kitchen (which is not that airtight) connected to a barn conversion, which I guess is 90% on the way to being 'passive house-ish' standard (at 1st fix so ducts sort of easy to route for both. Do we go for MVHR (prob. £4k total) or MEV prob. around £500. With the MEV we are looking at venting 4 bath/kitchens (and the MVHR more rooms). The MEV has trickle and high RH% boost. Does anyone have a feeling as to the relative energy saving costs of MVHR vs. MEV (i.e 20 year costs?). Or any other thoughts on which way to jump? As I write this I'm thinking MVHR is just too pricey and would never pay for itself in a house that isn't 100% passive a bit of waste of cash? Also, does MEV leave rooms feeling cold as you are continually stripping warm air out of them? Or is the trickle really at a low rate?
    Thanks in advance for any thoughts!
    • CommentAuthorjms452
    • CommentTimeFeb 10th 2019
     
    MVHR at that price isn't going to pay for itself but will be more comfortable (You will get drafts with MEV).

    What's driving the #4k cost? MVHR ducting is quite easy to diy and if you're at first fix you could probably get the electricals signed off by your electrician for very little...
    •  
      CommentAuthorDamonHD
    • CommentTimeFeb 10th 2019 edited
     
    Why not use some single-room MHRV to get some of the benefits without the ducting costs?

    http://www.earth.org.uk/MHRV-Vent-Axia-Lo-Carbon-Tempra-P-REVIEW.html

    Rgds

    Damon
    • CommentAuthorgravelld
    • CommentTimeFeb 10th 2019
     
    Also look at demand control MEV
    • CommentAuthortony
    • CommentTimeFeb 10th 2019
     
    MEV basically throws away heat, literally burns money
    • CommentAuthorgyrogear
    • CommentTimeFeb 10th 2019 edited
     
    Posted By: tonyMEV basically throws away heat, literally burns money


    +1

    (unless said heat is being drawn out of an overheating roofspace (for example...) and thrown away into a conditioned crawlspace (for example...).

    gg
    • CommentAuthortony
    • CommentTimeFeb 10th 2019
     
    If it were being delivered to somewhere else then it would no longer be called MEV
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