Will Air Conditioning Affect Your Timber Floors?
Air conditioning and heat pumps are now common in NZ homes. And because timber is a natural material, it’s normal to wonder if AC will cause problems.
Short answer: it can - but only if it creates extreme or prolonged humidity changes.
Timber floors constantly absorb and release moisture from the air. When indoor humidity drops, boards can shrink slightly; when humidity rises, they can expand. Air conditioning affects floors indirectly by changing humidity, not because cold or warm air “damages” the timber.
In most homes, AC is used normally and seasonally, and floors perform well. Issues tend to happen only when indoor air stays very dry or very humid for weeks at a time, or where vents blow directly onto the floor.
Solid timber is more sensitive to humidity swings, so you may notice more seasonal movement.
Engineered timber is built in cross-layers to reduce movement, making it a great option for modern, air-conditioned homes.
Best rule of thumb: if your home feels comfortable to live in, it’s usually comfortable for your floor too.
Simple Tips for Air-Conditioned Homes
Avoid extreme settings (super cold cooling or very hot heating).
Aim for steady comfort, not big on/off swings.
Keep vents from blasting directly onto the floor.
If your home gets very dry in winter, a small humidifier can help.
If your home is very humid in summer, gentle dehumidify mode and good extraction fans make a big difference.
Small seasonal gaps or tightening are normal - that’s timber behaving naturally.
FAQ
Will air conditioning ruin my timber floor?
No. Normal household use won’t ruin a timber floor. Problems only arise if AC causes long periods of very dry or very humid indoor air.
What’s the “safe” humidity range?
A practical comfort range is around 40-65% relative humidity most of the year. Short-term swings are fine - it’s prolonged extremes that matter.
Do engineered floors handle AC better than solid floors?
Yes. Engineered timber is designed to reduce expansion and shrinkage, so it’s more stable in air-conditioned homes.
Why do I see small gaps in winter?
Winter air is naturally drier, and heating can reduce humidity further. Timber may shrink slightly, creating fine gaps - this is normal and usually closes again in warmer months.
Should I use a humidifier?
Only if your home gets very dry for long periods (often noticeable if people feel dry skin/static). A small humidifier in main living areas can help keep conditions stable.
Can ducted AC cause more movement?
Potentially, yes - mainly if it runs constantly or vents blow directly onto the floor. Redirecting airflow and keeping settings moderate usually prevents issues.