kellygrzyb3 wrote: day and night temperatures, respectively, e.g. 21 and 17 degrees Celsius
The better the insulation of the apartment, the less effective such solutions are - because the temperature drops slowly.
Increasing thermal comfort at lower temperatures can be achieved by using underfloor heating or infrared heaters. The former reverses the natural temperature pattern, forcing higher temperatures near the floor, which gives a feeling of comfort at a lower average temperature. This is especially useful in high-rise rooms (old tenement houses), where a regular radiator creates a cushion of warm air near the ceiling (a gift for the upstairs neighbor...) and the floor is cold. Unfortunately, changing the heating system to underfloor heating requires a major renovation (including replacing the floor). In turn, infrared radiators release a large part of the energy in the form of infrared radiation, which the radiator directs in a selected direction, e.g. at a person sitting on a sofa or at a desk. This allows you to quickly and precisely heat selected places in a generally cool room. I am not a supporter of this solution, but objectively it is effective. In one apartment, I used it with good results in the bathroom to maintain a relatively low temperature of about 19°C, but to warm up people getting out of the shower.
A heat pump is a solution that objectively increases the amount of thermal energy supplied without increasing electricity consumption - this is how it differs from the previously discussed solutions. The COP coefficient, which determines the ratio of heat energy released into the room to electricity taken from the network, depends on the quality of the device but, above all, on the temperature difference - the larger it is, the worse it is. You can count on an average value of 3, which gives 2/3 of the savings and makes electric heating the cheapest.
Added after 20 [minutes]: fiiszu wrote: Could you please give me some recommendations for good heat pumps, for about PLN 2,000, matched to the size of the apartment? Because everything I find is terribly expensive
Right now, in autumn, you have the opportunity to find something on sale, normally it will actually be around PLN 2,500..3,000. Two years ago, in late autumn, I bought a pump reduced from PLN 2,700 to PLN 1,999, later on a well-known website there was an offer of an identical pump for PLN 1,799 (from the exhibition, but it is completely irrelevant in this case).
fiiszu wrote: My second question is, is such a pump connected to the compressor with a cable or pipe?
The connection includes an electric cable and two pipes with a heating medium, the total diameter (with the necessary insulation) is approx. 5 cm, and the pipes cannot be bent to a small radius, so the hole in the wall must be at least 6..8 cm in diameter and this is one of the biggest problems during assembly.
fiiszu wrote: Can this compressor be placed on bare ground (I have a garden)
Of course, yes, it is a very good solution also because its vibrations do not transfer to the building wall. You only need to prepare a small foundation, e.g. with curbs. The unit - depending on its power - weighs up to 50 kg. Free air flow must be ensured, requirements are always given, but typically min. 10 cm after the air inlet and 50 cm before the air outlet.
Pay attention to the installation method: most devices sold require the selection of tubes for a specific installation and filling them with gas after installation. This means the need to use a professional service and, consequently, the installation cost of several hundred zlotys.
However, there are also those that come with pipes of a specific length (e.g. 4 m) already filled with gas. If this length suits you, you can easily install such a pump yourself without incurring unnecessary costs. I write "unnecessary" because although experts - also on this website - emphasize the need for professional installation, from my experience (two pumps of this type) independent installation is simple, easy and does not entail negative consequences (one and two heating seasons so far). ).
If you have any doubts as to whether the power will be sufficient, do not worry, in the worst case, in case of low temperatures, you can always warm up the room with another heater in an emergency.
I look after several apartments in buildings heated with electricity, hence my experience.
