Hi
Just wondering is there anyone out there building a New house and not installing a MHRV?? or has built recently and didnt install!
We had been set on it but husband has been talked out of it by a few people (cost,noise,no difference noticed,maintenance,sealing etc).
I do feel the cold , husband does not, has windows opened all yr round for fresh air!!! But had him convinced he wouldn't have to if we had MHRV. We are on a very very tight budget but I am all for spending the money on the main things and leave a few rooms unfurnished for awhile. We are going hi spec for insulation, triple glazed, rads, back boiler stove and a wood burning stove,oil. Husband has said if we still do a good job on sealing for air tightness but not as strict as for the MHRV we will be fine but I am worried! I have read a lot of forums both here and on boards.ie where I see its a cardinal sin not to go down this route but I am just wondering what is, if anything an alternative??
I really don't want to regret it down the line as my mindset is do the best I can now so we wont be crippled with heating bills and have an inefficient house down the line but I am on a tight budget so I get u cant have the best of both worlds but just seeing will it not be in the worst thing ever if I lose this battle!!!
The following is the specification on which this provisional BER is based on:Who is specifying the insulation and ventilation details? What BER do they think you will achieve?
I've just finished an extension and major refurb for an old mid-50ies mid terrace.(85sqm --> 110sqm)
Apart from insulating the heck out of it (external 100mm throughout, 50-100mm internally in places), I've retrifitted a MHRV as part of the work.
The house is very airtight, triple-glazed Alu/PVC Windows, well insulated and draft-proved front door.
Was still a major PITA (retrofit always is I guess), but was well worth it, and the approx 4500 euro money well spent IMO.
- no need for an extraction fan in the bathroom, as standard MHRV exhaust well capable even in "normal" mode
- no condensation anywhere
- always fresh air - as there's usually nobody at home during the day there wouldn't be any airmovement at all without the ventilation. Also means that heat gets properly distributed across the house. Helps distributing the heat from the stove downstairs.
- no problem with noise, or with the system in general. filter replacement (recommended every 6 months, so need to in a few weeks) is straightforward. Doesn't use a lot of electricity in general
- "booster" mode great if you doing cooking or have a few people around and air gets stale
We ended up with a B2 rating, and that is without any solar panels of any kind. Using a solar ready cylinder though as insulation is twice of a normal cylinder.
I wouldn't bother with ventilation without heat recovery, and I really really hate drafts so trickle vents or similar where a big no-no. And with the building regulations requiring to put 100mm holes in your freshly insulated walls I certainly wouldn't want normal ventilation holes.
I've just finished an extension and major refurb for an old mid-50ies mid terrace.(85sqm --> 110sqm)
Apart from insulating the heck out of it (external 100mm throughout, 50-100mm internally in places), I've retrifitted a MHRV as part of the work.
The house is very airtight, triple-glazed Alu/PVC Windows, well insulated and draft-proved front door.
Was still a major PITA (retrofit always is I guess), but was well worth it, and the approx 4500 euro money well spent IMO.
- no need for an extraction fan in the bathroom, as standard MHRV exhaust well capable even in "normal" mode
- no condensation anywhere
- always fresh air - as there's usually nobody at home during the day there wouldn't be any airmovement at all without the ventilation. Also means that heat gets properly distributed across the house. Helps distributing the heat from the stove downstairs.
- no problem with noise, or with the system in general. filter replacement (recommended every 6 months, so need to in a few weeks) is straightforward. Doesn't use a lot of electricity in general
- "booster" mode great if you doing cooking or have a few people around and air gets stale
We ended up with a B2 rating, and that is without any solar panels of any kind. Using a solar ready cylinder though as insulation is twice of a normal cylinder.
I wouldn't bother with ventilation without heat recovery, and I really really hate drafts so trickle vents or similar where a big no-no. And with the building regulations requiring to put 100mm holes in your freshly insulated walls I certainly wouldn't want normal ventilation holes.
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