Somebody told you heat pumps are for cold countries. They heard it from someone who read it about Norway. The idea has travelled further than the physics — so here is the physics, in plain words.
What a heat pump actually does
A heat pump doesn't make heat the way an electric element or a flame does. It moves heat that already exists in the air into your water or your space. The machine spends a little electricity doing the moving — and the heat itself comes free, from the air.
Now ask the obvious question: where is there more heat to harvest — Manila air at 33 °C, or Oslo air at −5 °C?
That's the whole answer. Warm air is rich fuel. In Philippine conditions of 28–35 °C, a heat pump runs at its best: about 4 units of heat for every 1 unit of electricity. In peso terms: for every ₱1 of electricity, around ₱4 of heat.
You already own a heat pump. Your aircon is one — running in reverse, pumping heat out of your room. A heat pump water heater is the same machine pointed at a water tank instead. If your aircon copes with the Philippine heat, the argument is already over.
Where the myth came from
Cold countries. In a Scottish winter the fair question is whether a heat pump still works at −15 °C (modern ones do, with effort). That worry was imported here along with the equipment — but the Philippines doesn't have the problem. We imported the question without the climate.
The irony: the tropics are where heat pumps work best, and they're the last place people believe it.
What it means in pesos
The most expensive common way to heat water in this country is the electric shower or tank element: 1 unit of electricity in, 1 unit of heat out, full price every time. The same hot water from a heat pump uses up to 75% less energy. A hot-water bill that was ₱4,000 becomes roughly ₱1,000. For a hotel or food business, that line scales into the millions.
We've put the full side-by-side here: heat pump vs electric water heater — including where the cheap electric unit honestly wins.
The honest limits
- Temperature ceiling. Standard R290 heat pumps deliver water up to about 75 °C. True steam above 100 °C still belongs to combustion or CO₂ systems — that comparison is here.
- Airflow. The unit harvests heat from moving air. Squeeze it into a sealed hot cupboard and it has nothing to harvest. Placement matters; we design for it.
- Daily use pays fastest. The savings compound with every shower and wash. Light, occasional hot-water users have less to save.
Who's telling you this
Karnot Energy Solutions Inc. is a Philippine company in Mapandan, Pangasinan. We design and build natural-refrigerant heat pumps — AquaHERO for homes, iHEAT for businesses — engineered for exactly this climate, and serving the Philippines, the UK, the US and Canada.