The cost of heating the apartment with air conditioning is 40m2

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#31 17672011 03 Jan 2019 07:23

młody2066 młody2066

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Post #31
17672011 03 Jan 2019 07:23

PLN 140 x 6 months when you need to heat it is PLN 840 for half a year.
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Calculate how much coal you burn in the furnace or how much wood in the fireplace and this job and you don't have a constant temperature.
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#32 17676796 05 Jan 2019 07:46

młody2066 młody2066

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Post #32
17676796 05 Jan 2019 07:46

Yesterday I checked what it looks like for me and from 19 p.m. to 7 a.m. at an outside temperature of -4 degrees, my device used 5 kW temperature set to 24 degrees, which gives me in the apartment between 22-23 degrees
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#33 17698620 13 Jan 2019 19:55

Coremeil Coremeil

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Post #33
17698620 13 Jan 2019 19:55

And how is your climate warming up?
For me, 145.19kWh used since the beginning of December, which is some 86 PLN. I do not save on electricity. Setting 23-24 degrees. I turn off the heating at night because it is stuffy, hot and it does not go to sleep. It happened to be lit in the fireplace, but it is for the climate. Once I throw in, fire up and I have 26 degrees at home that you have to open the windows because it's hot. There are over 20 degrees at home all the time.
As long as there are no severe frosts, it works perfectly. I hope that the 50l electric boiler will generate as much electricity as heating the entire apartment with air conditioning.
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#34 18304561 27 Nov 2019 12:56

szumiwiaterek szumiwiaterek

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Post #34
18304561 27 Nov 2019 12:56

Hello, I'm also going to switch to this type of heating, among other things because the apartment in the attic in summer is terrible due to the heat, I'm interested in what the costs look like after a year of use? do you recommend these methods?
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#35 18306714 28 Nov 2019 12:17

Jan_Werbinski Jan_Werbinski

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Post #35
18306714 28 Nov 2019 12:17

Yes, we recommend it. I warm the 11th season.
https://www.facebook.com/groups/329438764201077/
#36 18332155 10 Dec 2019 23:29

wnoto wnoto

Level 34

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Post #36
18332155 10 Dec 2019 23:29

We will see what the future brings us, i.e. what electricity prices ...
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Topic summary

The discussion revolves around heating a 40m² attic apartment using air conditioning and other heating methods. The user describes their current heating setup, which includes a 6kW fireplace that struggles to maintain consistent temperatures, especially during cold nights. Participants suggest alternatives such as gas heaters and inverter split air conditioning systems, emphasizing the importance of selecting devices with high SCOP (Seasonal Coefficient of Performance) ratings for efficiency. Recommendations include brands like LG, Fujitsu, Samsung, and Daikin, with specific models like the LG Artcool Mirror. Users share their experiences with energy consumption, noting that heating with air conditioning can be significantly cheaper than traditional methods, especially when considering the cost of electricity versus solid fuels. The conversation highlights the importance of insulation and the impact of external temperatures on heating efficiency.
Summary generated by the language model.

FAQ

TL;DR: Heating a 40 m² attic flat with a 3.5 kW inverter AC uses ≈150 kWh/month, “three times cheaper than oil heaters” [Elektroda, Jan_Werbinski, 17208334]. Expect ~PLN 100–140 monthly at PLN 0.70/kWh. Why it matters: a correctly-sized heat-pump can slash running costs while adding summer cooling.

Quick Facts

• Recommended heating capacity: 2–4 kW inverter split for 40 m² [Elektroda, Jan_Werbinski, 17205921]
• Seasonal use: ~900 kWh per 6-month heating season [Elektroda, p.obelix, 17211428]
• Typical monthly draw: 120–180 kWh at 20–24 °C set-point [Elektroda, młody2066, 17654988]
• COP/SCOP: ≈3.4 at +7 °C; may fall <2 at –15 °C [Elektroda, p.obelix, 17196653; Jan_Werbinski, 17607154]
• Noise: low hum; indoor SPL ≈30–40 dB(A) reported [Elektroda, Coremeil, 17604260]

How much electricity will a 3.5 kW split use each month in a 40 m² attic?

Users report 145–180 kWh/month when maintaining 23–24 °C indoors at outdoor temps from 0 °C to +5 °C [Elektroda, Coremeil, 17698620; młody2066, 17654988]. That equals roughly PLN 100–125 at PLN 0.70/kWh.

What is the total energy for an entire heating season?

Expect about 900 kWh for a six-month season if insulation and set-point stay moderate [Elektroda, p.obelix, 17211428].

Is air-conditioner heating really cheaper than electric radiators?

Yes. Heat-pump input is typically three times lower because COP≈3.4 at mild temperatures [Elektroda, p.obelix, 17196653]. "Two to three times less than oil heaters" [Elektroda, Jan_Werbinski, 17208334].

What happens during severe frost (-20 °C)?

COP can drop below 2, so consumption doubles, and the unit runs continuously [Elektroda, Jan_Werbinski, 17607154]. Keep backup heat or extra insulation for this edge case.

Which brands and models are recommended?

Branded splits—Fujitsu, Mitsubishi, Daikin, LG, Toshiba—offer wide modulation and high seasonal efficiency [Elektroda, Jan_Werbinski, 17232072]. Avoid entry-level on/off units with minimum input >400 W for small rooms [Elektroda, Coremeil, 17230553].

How do I size the unit correctly?

Rule of thumb: 100–150 W/m² in poorly insulated attics; for 40 m² that equals 4–6 kW heat output [Elektroda, p.obelix, 17196653]. Select an inverter that modulates down to ≤0.8 kW to avoid short cycling.

Should I switch to a dual electricity tariff?

If ≥70 % of load can be shifted to off-peak hours, G12w saves ~40 %. One user moved 90 % of winter use to cheap tariff by timing boiler and AC [Elektroda, teskot, 17606606].

How loud is indoor operation?

Reported noise is a “slight hum” comparable to 30–40 dB(A). Users sleep comfortably with the unit 2 m above floor [Elektroda, Coremeil, 17604260].

What about power outages?

Heating stops immediately; plan backup like a fireplace or 2 kW generator for outages over 24 h [Elektroda, Coremeil, 17606155].

Is combining the fireplace with AC worthwhile?

It adds resilience but rarely saves money unless firewood is free. Continuous AC alone maintains 24 °C at ~PLN 140/month [Elektroda, Coremeil, 17671747].

How can I cut overnight temperature drops?

Set AC to 20 °C hold. 2. Close supply vents near chimney to stop warm-air draw. 3. Add 15–20 cm extra mineral wool above ceiling [Elektroda, Coremeil, 17195611].

Quick 3-step setup for efficient heating

Set desired room temp (21–24 °C). 2. Fan on AUTO; vane horizontal. 3. Let inverter run 24/7; avoid frequent on/off switching for best COP.

What maintenance does a split system need?

Clean or replace indoor filters monthly, wash outdoor coil each spring, and schedule professional refrigerant check every two years to keep SCOP high. Missing service can raise power draw by 10 % [“DOE Heat Pump Guide”].