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講到energy saving節能環保不得不提Ottawa都builder建passive house嘅，每年home show都有展覽。Passive house有super insulation係算做話airtight嘅(當然有啲heat exchange ventilation。買地起屋嘅話可以考慮考慮，可能慳倒75% heating cost。以下呢個係見過嘅builder 。
2500+ 尺house plan 嘅攞過quote要$500k (2019價格) 建屋，自己要買地。
