MCS Heat Loss Calculations - Air Source Heat Pumps (ASHPs) https://renewableheatinghub.co.uk/forums/renewable-heating-air-source-heap-pumps-ashps/mcs-heat-loss-calculations/ Questions and discussions about renewable heating and heat pumps en-GB Fri, 12 Jun 2026 21:06:42 +0000 wpForo 60 RE: MCS Heat Loss Calculations https://renewableheatinghub.co.uk/forums/renewable-heating-air-source-heap-pumps-ashps/mcs-heat-loss-calculations/#post-30107 Sat, 20 Apr 2024 13:33:24 +0000 I don't know about 'rules'; I did my calculations by first principles, considering where any heat would be lost.  Basically, first floor ceiling losses into the loft, ground floor losses into the floor and any external walls and windows. Add in a consideration for 'air change' and drafts.

Exactly.  Hall, stairs and landing are just another room, like any other.

 

]]> Air Source Heat Pumps (ASHPs) JamesPa https://renewableheatinghub.co.uk/forums/renewable-heating-air-source-heap-pumps-ashps/mcs-heat-loss-calculations/#post-30107 RE: MCS Heat Loss Calculations https://renewableheatinghub.co.uk/forums/renewable-heating-air-source-heap-pumps-ashps/mcs-heat-loss-calculations/#post-30106 Sat, 20 Apr 2024 13:30:36 +0000 I don't know about 'rules'; I did my calculations by first principles, considering where any heat would be lost.  Basically, first floor ceiling losses into the loft, ground floor losses into the floor and any external walls and windows. Add in a consideration for 'air change' and drafts.

]]> Air Source Heat Pumps (ASHPs) IanMK13 https://renewableheatinghub.co.uk/forums/renewable-heating-air-source-heap-pumps-ashps/mcs-heat-loss-calculations/#post-30106 MCS Heat Loss Calculations https://renewableheatinghub.co.uk/forums/renewable-heating-air-source-heap-pumps-ashps/mcs-heat-loss-calculations/#post-30103 Sat, 20 Apr 2024 12:20:15 +0000 I have a very specific question about completing heat loss calculations.
What are the rules to measure heat loss from stairs?
Are they ignored, included in the volume of the landing, etc. The room list in MCS spreadsheet does not mention stairs and nor do any of the examples of diy heat loss (that I can find).

]]> Air Source Heat Pumps (ASHPs) jswhite https://renewableheatinghub.co.uk/forums/renewable-heating-air-source-heap-pumps-ashps/mcs-heat-loss-calculations/#post-30103