Gale & Snowden’s thermal modelling work carried out under the TSB’s Design For Future Climate (D4FC) programme confirms that:  Highly insulated, very air tight buildings like passive houses are able to maintain comfortable summer conditions without active cooling.  Due to their increased thermal lag, they have the ability to keep warm or cool for a longer period of time.  Because of this, night cooling or subsoil heat exchangers appear especially successful in passive houses.

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