Region: All States
Assessor Question:
Can a dog/cat door be installed into an existing dwelling without impacting the existing NatHERS rating?
TechLink Response:
- There is no specific data entry for pet doors in NatHERS ratings.
- The surface area of the wall taken up by the pet door is insignificant in relation to the rest of the wall area.
- To be absolutely accurate a tiny door may be entered as a door.
- Another impact if installed in a sliding window will be to reduce the openability % of the sliding sash.
- Also if installed to replace some glass there will be a very minor alteration to the U and SHGC values but the change will be virtually immeasurable.
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