The World Health Organisation recommends a minimum internal temperature of 18°C. For people with health conditions or elderly, this this should be warmer.
Quality, well-installed ceiling and underfloor insulation is the top priority for a warmer, healthier home. Wall insulation is best installed when you are renovating and replacing wall linings.
Check out whether you are eligible for a Government Warmer Kiwi Homes grant offering ceiling and underfloor insulation and/or an efficient heater. Grants are for lower-income homeowners living in their homes and cover 90% of the cost (heaters capped at $3,000, including GST).
Portions of this were sourced from BRANZ Home Series Bulletin 8 “Reducing heat loss” www.branz.org.nz