Heat Pump Installation Mistakes to Avoid

Mistakes That Show Up Immediately

Undersizing the tank is the most common mistake we're called in to fix — a household runs out of hot water at peak times because the original installer didn't account for real usage patterns. Poor outdoor unit placement is a close second: blocking airflow to save space, or ignoring noise considerations near bedrooms, both cause problems that are expensive to correct after the fact.

Skipping a proper site survey in favour of a phone estimate is where many of these mistakes start — accurate sizing and placement decisions simply can't be made without seeing the property.

Mistakes That Show Up Later

Choosing an installer without proper certification or manufacturer training often doesn't show up as a problem immediately, but tends to surface as early faults, voided warranties, or work that doesn't meet the manufacturer's installation standards. Along the coast, ignoring corrosion protection — using standard rather than titanium heat exchangers and marine-grade coatings — is a mistake that quietly shortens the system's lifespan by years.

Our best heat pump company guide covers exactly what to check before choosing an installer, and our installation process guide walks through what a properly run installation actually looks like.