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About us

ALTHERM is a well known brand in the New Zealand building industry and has been an innovator in windows and doors for over 40 years. We have a strong following among homeowners, designers and builders throughout New Zealand.

In addition to the popular ALTHERM Residential range our manufacturer network offers a complete portfolio of high performance products for both thermally efficient, and larger format windows and doors.

ALTHERM is a brand of APL, the largest window solutions organisation in New Zealand

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