One of the most stringent parts of this legislation is heating.
Landlords must have enough fixed heaters installed so that a whole living room can be heated to 18 degrees, even on the coldest day of the year.
That means properties in Invercargill, where temperatures are cooler, will require more heating than those in Northland, where temperatures are warmer.
Investors can use an online assessment tool to calculate the minimum kilowatts needed within the heating appliance to meet this standard. If you’re using a professional company for your Healthy Homes inspection, they will do this for you.
For instance, running the tool on a 30m2 room in Christchurch City with single glazing resulted in the need for a 6.2kW heat pump.
That’s based on the coldest temperature in Christchurch being -4 degrees and the heat pump needing to raise the whole room’s temperature by 22 degrees.
Before you calculate the online assessment you’ll need to measure your lounge walls and windows first, plus note whether your windows are single or double glazed.
Your room’s shape will also impact how much heating you need. If you have an open staircase that can’t be walled off, the entire hallway and staircase will be considered part of the heating assessment.
One previous quirk around the act is that older, draughtier homes sometimes had an easier time meeting heating standard compared to newer, drier homes. The reason for this is that heating is only required for the living area and because newer homes tend to be more open plan, a significant heat pump was required to meet the standards. On the other hand, the living room in an older property tended to be smaller.
There have been recent changes to the heating calculation tool to take into account the building code standards under which a property has been constructed or renovated to. This generally means more modern homes will require less heating for similar sized living areas than older homes. There are now seven timeframes a property will fit into when calculating the heating standards:
1977 or earlier
From 1978 to 2000
From 2001 to 2008
From 2009 to 2 November 2022
From 3 November 2022 to 30 April 2023
From 1 May 2023 to 1 November 2023
From 2 November 2023 onwards