1) First: yes, "air conditioning" can make things hot.
Technically, a reversible air conditioner is an air-to-air heat pump . Daikin explains that an AC is an air-to-air heat pump (it uses energy from outside air to condition the indoor air).
And DECO reinforces that heat pumps are very efficient for heating homes/water, with low impact, when well chosen.
2) What is SCOP (and why does it matter in heating)?
SCOP stands for seasonal heating efficiency (the higher, the better). It aligns with the energy labeling and seasonal efficiency logic used for AC units in the EU.
In practice: for frequent heating, it's worth choosing models with good SCOP .
3) When is it worthwhile to use air conditioning for heating in Portugal?
In many Portuguese homes (with mild winters, but cold houses due to insulation), reversible AC can be an efficient solution for:
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bedrooms and living rooms (zone heating)
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Who wants cold in the summer and heat in the winter with just one system?
DECO highlights heat pumps as an efficient way to heat, and this includes air-to-air heat pumps (reversible air conditioning).
4) Practical tips for heating better (and spending less)
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Stable temperature instead of "maximum/on-off" (better for comfort)
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Closed doors (room-by-room heating)
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Filter cleaning : improves airflow and performance (DECO recommends cleaning/maintenance routines).
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If the house is damp, using dehumidifiers can improve thermal comfort.
5) Installation and maintenance: certified technician (serious matter)
For fixed systems using fluorinated gases, the APA has information on HVACR technician certification and official listings.
This gives the end customer confidence and reduces the risk of leaks/problems.
FAQ
Does an air conditioner use less energy than an electric heater?
In many scenarios, heat pumps are more efficient for heating than electric resistance heaters (depending on the equipment and usage). DECO highlights heat pumps as an efficient solution.
Which is better: a radiator/heater or a reversible air conditioner?
For heating for several weeks/months, a reversible heater may be more efficient; for very occasional use, a simple heater may suffice (but the cost per hour may increase).