Is it worth investing in a reversible heat pump?

According to Ademe, the environmental transition agency, twice as many heatwaves are expected by 2050…

The more heat a building stores in its walls, roof, floors, the slower it heats up and cools down. Good insulation improves summer comfort in the absence of air conditioning. Because this equipment, if it is useful, consumes a lot of energy.

Insulate the roof and walls of the house

“By effectively insulating your home, you reduce air exchange between the indoor and outdoor environment,” explains Hello Watt, a platform that helps people control their energy consumption and bills.

“It has the advantage of keeping us warm in the winter and also lowering the temperature in the summer. “And keep it indoors “at a tolerable level, around 25 ° C,” the web platform says.

Roof insulation is “necessary because, after openings, it is the roof that brings in the most heat in summer,” Ademé notes.

Insulation of external walls is effective both in summer and in winter.

The main state aid, MaPrimeRénov’, for example, provides a flat rate of 75 euros per m2 the most modest households to insulate the outer walls.

Facade renovation: preference is given to light colors

The brighter the surface, the more it reflects solar radiation and the less it retains heat.

“Pale coatings, white paints, decontaminated concrete are very effective for summer comfort, especially for walls in the south and west, which are particularly exposed to the sun,” notes Ademé. Using light colors for roofs can also be a good solution. For flat roofs (eg buildings), heat reflective coating materials have been developed: reflective elastomer or polyurea membranes, light gravel, reflective coatings. »


Adobe stock illustration

Install sun protection

To keep the sun out of windows, external sunscreens such as roller shutters, blinds, or adjustable sunscreens, as well as sunshades, screens, and awnings, are effective.

Install a reversible heat pump

A reversible heat pump (pac) can help deal with abnormal heat.

“While conventional air conditioning is very harmful to the environment, reversible heat pumps are environmentally friendly,” says Hello Watt. They use very little electricity, which in France is mostly carbon-free, and the efficiency of the heat pump (close to 4.5) makes it possible to compensate for enough heat in winter and coolness in summer to ensure optimal comfort in the house. house. »

If a reversible heat pump requires between 8,000 and 16,000 euros, the balance can be reduced with MaPrimeRénov’, which has just been increased by 1,000 euros to encourage the French to purchase this heating system.

Plant outside the house

Plants provide shade and also cool the atmosphere. According to Ademé, one mature tree on the plantation evaporates 450 liters of water a day, which is the equivalent of five air conditioners running 20 hours a day!

Planting of deciduous plants (falling in autumn) is recommended. They provide a pleasant shade in the summer and do not block the sun in the winter.

It is best to avoid mineral surfaces (such as stone or concrete walkways or terraces) that retain heat all day and release it at night…