HVAC Estimating Services in New Zealand

Bathrooms, kitchens and laundries need ventilation under Building Code clause G4, and extract fans are a common way to meet it. We count extract fans from the drawings and note where they appear to be missing.

Rental properties must meet the Healthy Homes Standards, which include heating and ventilation requirements. If you are upgrading a rental, we can measure the work, but compliance with the standards remains the landlord's responsibility.

We measure and price to the drawings. Design compliance and building consent remain with your designer and building consent authority.

Where hvac estimates go wrong

HVAC estimates often miss the work around the equipment: electrical supply, condensate drains, wall penetrations and brackets or plinths for outdoor units.

Ventilation is another gap. Extract fans for bathrooms, kitchens and laundries are required, and balanced ventilation systems need ducting and outlets throughout the home.

Sizing is the final trap. A heat pump that is too small for the space runs flat out and struggles on cold mornings; one that is too large cycles on and off, wastes energy and may not dehumidify well. We do not size equipment ourselves, because that depends on heat loss calculations, room use and orientation, but we flag units that look small or large for the space they serve, so you can check them with the installer before pricing is locked in. On renovation projects, we also note where existing electrical supply, ceiling space or outdoor unit locations are likely to limit the system choice, because these constraints often decide whether a ducted system is practical at all. Getting that decision right before tender avoids redesign and repricing later in the job. We also note filter access. Filters need regular cleaning, so their location matters to clients.