Ben Sorensen

Fogged-up double glazing isn't a full window job, but it's not a handyman job either. Here's how to vet whoever's quoting the reglaze.

A licensed electrician and an accredited battery installer aren't always the same person. Here's how to check who's actually allowed to sign off your job.

NatHERS and HERS ratings run on averaged climate data, not this year's weather. Here's why that matters and what it can't predict.

NatHERS and HERS ratings model a standardised occupant, not your family. Here's what that assumption actually covers and why it matters.

Insulation work is barely regulated in most states. Here's the licensing and compliance paperwork that actually separates a safe installer from a risky one.

Two NatHERS assessors, same house, different star ratings. It happens more than people admit — here's why, and what actually drives the gap.

A NatHERS or HERS rating models your house on paper, but the assessor's orientation assumptions can miss what actually happens outside your windows.

A high NatHERS or HERS score doesn't guarantee comfort. Here's what the rating actually measures, and where the gap between star rating and lived experience opens up.

A star rating tells you where a house lands, not why. Here's how to read the assessor's supporting data to find your actual weak point.

Glazing quotes vary wildly because installers vary wildly. Here's how to check certifications, U-value claims and installation method before you sign.

Air sealing has almost no licensing barrier to entry. Here's how to check who's actually qualified before they caulk your house shut.

A NatHERS star rating isn't fixed to the house — orientation data, software versions and even climate files can shift the number. Here's what actually moves it.

Triple glazing earns its keep in genuinely cold climates and noisy sites. In a mild Australian or southern-US climate, the payback math rarely favours the third pane over spending the same money elsewhere.

Insulation slows heat transfer through a surface. Air leaks bypass that surface entirely. Seal the gaps first, or you're insulating a house that's still breathing uncontrolled air through its own envelope.

The star rating or index number on your certificate is the output of a detailed on-site inspection, not a desktop guess. Knowing what an assessor actually measures explains why two similar-looking homes can score very differently.

An R-value on a product label describes the material, not necessarily how it performs once installed. The questions that matter are about installed performance, not the number on the bag.

Australia and the USA both rate how energy-efficient a home's design is — but the two systems score in opposite directions and measure different things. Here's how to read each one.