Pool Heat Pump Retrofit ROI & Carbon Calculator

Pool heat pumps lose 1.5–2.0% of their COP per year of service, primarily from compressor wear, fouled coils, and refrigerant migration. After 8 years a unit rated at COP 5.0 typically delivers an effective COP of 4.2 — meaning 19% more electricity to do the same job.

All split heat pumps lose a fraction of their refrigerant charge each year through joints, schraders, and end-of-life disposal. R410A has a Global Warming Potential of 2,088 — every 1 kg leaked is the climate equivalent of 2.1 tonnes of CO₂. The Karnot iSPA Inverter uses R290 (propane), with a GWP of 3 — over 99% less per kg leaked. This is the Scope 1 component of your carbon footprint.

Scope 1 is direct emissions from your equipment — in this case, refrigerant leaks. Scope 2 is indirect emissions from purchased electricity. The Philippines grid emits about 0.71 kg CO₂ per kWh (largely coal). For ESG reporting, condos and commercial pool operators must account for both.

Pools target 28–30°C against a 30–32°C ambient — effectively zero net lift. The iSPA Inverter's DC inverter compressor slows down when the pool needs less heat: rated COP is 6.6–7.4 at full output and 14.6–17.2 at half output (air 27°C, water 26°C). This calculator assumes a blended COP of 9.5 across the year.

In most cases, yes. iSPA Inverter units have 50 mm water connections, and the 10–27 kW models run on the same 220–240 V single-phase supply as most existing pool heat pumps (23 and 27 kW also come in 380–420 V three-phase; 32 and 40 kW are three-phase only). Site-specific work is limited to connection and commissioning. Karnot will run a free site assessment before quoting.