ᐅ Heating / HVAC

Learn how to choose the optimal heating and cooling systems for your home – ensuring comfortable temperatures and greater energy efficiency in everyday living!

LAS pipe (exhaust pipe for gas boiler) installed externally – how to decouple it from the masonry?

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naliain•22 May 2026 18:28

Answers: 0

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naliain • 22 May 2026 18:28

Replacing Radiators Using an S-Connector

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Belenos•7 May 2026 11:56

Answers: 3

Knöpfchen • 8 May 2026 11:02

Underfloor heating from 1981, I have some questions :)

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Schroedi•14 Apr 2026 00:13

Answers: 1

Musketier • 14 Apr 2026 08:21

Exhaust fan for storage room / pantry

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Flitz86•7 Apr 2026 00:37

Answers: 9

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nordanney • 7 Apr 2026 12:42

Additional Heating Ditra Heat E for Tiled Floors – Is It Configurable?

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Marsupilam•3 Apr 2026 07:20

Answers: 0

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Marsupilam • 3 Apr 2026 07:20

Passive House with Mechanical Ventilation and Heat Recovery plus a Post-Heating Coil – A Bad Idea?!

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Georg86•14 Mar 2026 14:04

Answers: 0

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Georg86 • 14 Mar 2026 14:04

Avoid Freezing of the Underfloor Heating System

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Bierwächter•17 Feb 2026 19:42

Answers: 5

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Grundaus • 18 Feb 2026 12:49

Is a Heating Water Softening Unit Worthwhile?

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baddy•3 Feb 2026 12:49

Answers: 6

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Bierwächter • 6 Feb 2026 18:43

Infrared Panels and Photovoltaic Systems in Older Buildings

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Edi•3 Feb 2026 11:57

Answers: 1

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nordanney • 3 Feb 2026 12:10

Experiences with Retrofit Underfloor Heating Systems

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NausW•23 Jan 2026 07:55

Answers: 0

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NausW • 23 Jan 2026 07:55

Retrofitting a decentralized ventilation system in the bedroom

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Flipp147•19 Jan 2026 19:58

Answers: 0

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Flipp147 • 19 Jan 2026 19:58

Multi-day Power Outage as Currently Experienced in Berlin: Risks for Heating Systems and Water Pipes?

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Pianist•6 Jan 2026 10:01

Answers: 61

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MachsSelbst • 19 Jan 2026 16:04

Underfloor Heating in Older Homes with Adjacent Rooms of Different Floor Levels

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patrikw•14 Jan 2026 22:55

Answers: 0

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patrikw • 14 Jan 2026 22:55

Energy Demand: Snow on Skylights & Shutters with Triple Glazing in Winter

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stromneuling•24 Dec 2025 14:05

Answers: 9

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stromneuling • 11 Jan 2026 14:22

Ventilation Concept: Experiences with Decentralized Fans

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julia123•11 Jan 2026 09:45

Answers: 1

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nordanney • 11 Jan 2026 11:18

Do zoning regulations force homeowners away from heat pumps?

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thatniks•3 Jan 2026 21:38

Answers: 13

11ant • 5 Jan 2026 16:37

Frost Protection in the Heating Circuit: Preparing a Vacation Home with a Gas Boiler for Winter?

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Authentic1•4 Jan 2026 21:29

Answers: 1

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Nauer • 5 Jan 2026 11:11

Adjusting the Flow Rate of Underfloor Heating with an Air Source Heat Pump

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delbau•27 Dec 2025 15:28

Answers: 16

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delbau • 31 Dec 2025 11:07

Decentralized Exhaust System LWA 252/100 for Semi-Detached House – Is It Worth It? Looking for Experiences

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Bayernbors•30 Dec 2025 19:36

Answers: 4

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Gerddieter • 30 Dec 2025 22:38

Stiebel Eltron LWZ 504 – User Experiences and Settings

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Steven3003•27 Dec 2025 19:34

Answers: 4

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Steven3003 • 30 Dec 2025 22:30

Is it possible to run electric radiators continuously?

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kurti2025•20 Dec 2025 10:26

Answers: 4

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wiltshire • 21 Dec 2025 09:46

Wood Chip Boiler Hargassner / Error 220: Grate Motor or Limit Switch Malfunction

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BobRoss•19 Dec 2025 20:35

Answers: 0

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BobRoss • 19 Dec 2025 20:35

Desalination of Heating Circuit Water in Single-Family Homes with Gas Boilers – Necessary or Just a Sales Gimmick?

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Odyssee77•15 Dec 2025 14:24

Answers: 4

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nordanney • 15 Dec 2025 21:12

Connection of a new underfloor heating system to an existing gas boiler with a planned future switch to a heat pump

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trissedp•5 Dec 2025 13:32

Answers: 4

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trissedp • 12 Dec 2025 12:31

Old Radiators: How to Identify Hemp or Asbestos Rope and Replace It Safely – Tips

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SchönerWohnen•11 Dec 2025 10:18

Answers: 3

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nordanney • 12 Dec 2025 09:17

The Vaillant VCW 196EC is experiencing intermittent operation issues.

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Curiosius•28 Nov 2025 10:46

Answers: 21

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Curiosius • 4 Dec 2025 07:38

Gas boiler ... How to refill water correctly? What is the proper sequence?

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Curiosius•1 Dec 2025 18:32

Answers: 2

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Curiosius • 1 Dec 2025 22:32

Gas consumption four times higher than advance payment

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HilfeHilfe•24 Nov 2025 06:58

Answers: 16

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MachsSelbst • 27 Nov 2025 18:49

Moisture on OSB Panels after Installing Air Conditioning Unit

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SebastianNRW•20 Nov 2025 14:07

Answers: 4

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SebastianNRW • 26 Nov 2025 15:36

Infrared Heater and Smart Plug

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stromneuling•24 Nov 2025 09:31

Answers: 10

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nordanney • 24 Nov 2025 21:30

6.5 cm Floor Construction with 3 cm Anhydrite Screed F5 – Which System Is Most Suitable?

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Olli1989•18 Nov 2025 13:49

Answers: 4

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nordanney • 24 Nov 2025 16:17

The underfloor heating circuit and the radiator heating circuit each have a maximum flow rate of 0.3 m³/h.

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WFJH2022•16 Nov 2025 20:10

Answers: 0

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WFJH2022 • 16 Nov 2025 20:10

Alpha Innotec LWD 70 A Issue with Compressor

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StephRaa•13 Nov 2025 12:12

Answers: 1

tomtom79 • 13 Nov 2025 19:17

Heating system design for a new build garage due to space constraints

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Lordgandalf•8 Nov 2025 19:22

Answers: 5

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hanghaus2023 • 9 Nov 2025 13:01

Analog room thermostat – can it be replaced with a digital thermostat?

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fjwalter•8 Nov 2025 15:50

Answers: 5

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Nauer • 8 Nov 2025 23:43

Problems with mold during renovation due to insufficient or incorrect heating

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onkelchico•2 Nov 2025 22:09

Answers: 4

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nordanney • 3 Nov 2025 08:47

Supporting Heating with a Heat Pump

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masterblaster•19 Oct 2025 17:19

Answers: 2

tomtom79 • 19 Oct 2025 20:15

Outdoor heat pump unit very noisy – possible solutions? Quiet mode? Effects?

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Tx-25•31 Jan 2022 10:58

Answers: 27

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wiltshire • 17 Oct 2025 01:21

Routing of Heat Pump Piping in New Construction – Challenges

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jules_252•28 Sep 2025 14:49

Answers: 5

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ajokr2025 • 28 Sep 2025 16:59

Question about the Helios ventilation system and whether it requires regular maintenance

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Lüftikus•23 Sep 2025 04:39

Answers: 10

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Allthewayup • 25 Sep 2025 14:15

New Construction – Is High Humidity Still Normal?

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Sina_89•23 Sep 2025 06:11

Answers: 8

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Aloha_Lars • 24 Sep 2025 16:48

Should underfloor heating in the basement be kept running continuously?

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NilsHolgersson•23 Sep 2025 14:18

Answers: 5

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nordanney • 23 Sep 2025 20:09

Semi-detached house from 2008 – gas heating system malfunctioning – what to decide?

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Max1809•22 Sep 2025 22:02

Answers: 5

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ajokr2025 • 23 Sep 2025 19:56

Proxon FWT 2.0 Temperature Discrepancy

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Ghostflyer•22 Sep 2025 19:58

Answers: 5

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ajokr2025 • 23 Sep 2025 07:09

Experiences with split air conditioning units in defrost mode?

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KlimaRolle•3 Sep 2025 12:53

Answers: 6

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KlimaRolle • 3 Sep 2025 20:03

Bathroom in an older building: Is a second radiator necessary? And if so, should it be electric?

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jverbeek•2 Sep 2025 08:01

Answers: 7

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hanse987 • 2 Sep 2025 20:37

Depth of the trench collector for a ground-source heat pump with brine-water system

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mr.rider•28 Aug 2025 13:42

Answers: 2

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wiltshire • 28 Aug 2025 18:07

Can I power an air conditioner with a small solar panel system installed on a balcony?

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frankmehlhop•12 Jul 2025 15:07

Answers: 9

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MachsSelbst • 25 Aug 2025 10:25

Weishaupt (split system) or Kermi (monoblock unit)

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M. Gerd•10 Nov 2019 22:03

Answers: 14

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Alhtk24 • 20 Aug 2025 21:59

Radiator quotation for bedroom

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Axel900•17 Aug 2025 14:18

Answers: 5

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nordanney • 18 Aug 2025 08:35

Bathroom Renovation/Refurbishment Underfloor Heating

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Inifx1119•15 Aug 2025 17:38

Answers: 2

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Mrnobody • 17 Aug 2025 06:23

Is Techem energy billing reliable? Experiences and comparisons with other providers

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Larusso_12•19 Jul 2025 21:06

Answers: 5

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Larusso_12 • 4 Aug 2025 14:57

Experiences with Split Air Conditioning in Older Homes – What Should Be Considered?

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Karkus99•31 Jul 2025 13:40

Answers: 1

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GerryG • 31 Jul 2025 18:15

Heating with ice, ice-based heating systems for single-family homes, user experiences

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stefanh•28 Aug 2013 20:09

Answers: 23

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chris18 • 26 Jul 2025 23:56

Ice Storage Systems in Prefabricated Houses (New Construction) – Providers

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Mila2405•22 Jun 2023 08:04

Answers: 21

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alles3d • 26 Jul 2025 22:03

Tapping/Clicking Sounds from the Heating Manifold

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DitUndDat•23 Jul 2025 22:13

Answers: 1

Knöpfchen • 25 Jul 2025 14:28

Sizing HVAC System, Any Experiences?

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netzplan•1 Jul 2025 14:22

Answers: 6

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netzplan • 14 Jul 2025 16:46

Radiator with a length of 2.7 meters

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V_Orban•2 Jul 2025 16:08

Answers: 5

Knöpfchen • 6 Jul 2025 22:02

How can you cool down a house without air conditioning?

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FrankChief•30 Jun 2025 11:55

Answers: 36

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nordanney • 2 Jul 2025 14:21

Which Heating System Is Suitable for a Multi-Family House If a Heat Pump Is Not Eligible for Incentives?

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deri254•24 Apr 2023 17:18

Answers: 23

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wiltshire • 26 May 2025 15:31

Replacement of defective circulation pump Vortex (BW)Z 152

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Newbi23•23 May 2025 21:05

Answers: 4

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MachsSelbst • 25 May 2025 18:50

New construction KfW 50 energy standard with air-source heat pump and hydronic fireplace

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Sebastian1986•18 Apr 2025 17:48

Answers: 7

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Franke89 • 7 May 2025 20:18

Ceiling heating in a top-floor apartment

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Alchemist•7 Apr 2025 14:41

Answers: 3

Lüftermax • 2 May 2025 00:58

COP / annual performance factor below 1 due to an unsuitable domestic hot water station

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LudwigMuc•25 Apr 2025 17:03

Answers: 3

Lüftermax • 1 May 2025 21:06

New bathroom radiator just won’t heat up

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Rol_Rom•6 Dec 2024 19:02

Answers: 6

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Felix1993 • 29 Apr 2025 10:36

Heat pump combined with photovoltaic system

Musketier•14 Mar 2025 10:07

Answers: 15

Nida35a • 16 Mar 2025 20:10

Location of heat pump – ventilation duct closed window

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Newbi23•9 Mar 2025 07:43

Answers: 7

Tolentino • 13 Mar 2025 18:20

Heating Capacity Calculation and Selection of the Heat Pump

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Elias85•14 Nov 2023 22:13

Answers: 31

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Häuschenbauer4 • 5 Mar 2025 19:51

Combining a heat pump heating system with air conditioning?

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Rafaelsen•26 Feb 2025 10:15

Answers: 6

rick2018 • 27 Feb 2025 21:50

Running Underfloor Heating in the Basement Without Insulation or Milling?

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oliotb•23 Aug 2022 13:16

Answers: 1

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realmadridcf09 • 19 Feb 2025 20:07

Heating system gurgles despite having an automatic quick air vent

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jx7•9 Feb 2025 12:08

Answers: 6

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jx7 • 11 Feb 2025 11:05

KfW 40 standard, ground-source heat pump worthwhile or better air-to-water?

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itizniti•10 Feb 2025 19:22

Answers: 15

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Stephan— • 11 Feb 2025 10:50

Hot Water Heat Pump 12-Year Maintenance/Replacement

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VanTide•10 Feb 2025 11:40

Answers: 0

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VanTide • 10 Feb 2025 11:40

Nighttime Carbon Monoxide Alarm from Wood-Burning Stove

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Arauki11•6 Feb 2025 12:42

Answers: 1

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wiltshire • 9 Feb 2025 10:40

Instantaneous water heater despite gas central heating?

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nagner99•31 Jan 2025 17:50

Answers: 3

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ypg • 1 Feb 2025 16:14

The Wolf CGB 2-14 cycles continuously and consumes a lot of gas.

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Jens Kaufmann•26 Jan 2025 13:31

Answers: 1

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ypg • 28 Jan 2025 14:37

Deactivate power for Evenes VM 20404-00-766-01

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iDM2025•27 Jan 2025 09:20

Answers: 0

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iDM2025 • 27 Jan 2025 09:20

Experiences with electric fireplaces?

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bwollowb•16 Jan 2025 08:49

Answers: 6

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nordanney • 20 Jan 2025 15:58

Basement – Is it advisable to have 2 separate underfloor heating circuits in a new build?

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mm56789•16 Jan 2025 09:58

Answers: 3

11ant • 16 Jan 2025 15:31

Strong odor when turning down the underfloor heating system

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JulesF1604•12 Jan 2023 22:24

Answers: 20

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wiltshire • 12 Jan 2025 12:03

Brötje BWL Neo 8 – Issues with the Settings

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Kati2022•13 Dec 2024 17:15

Answers: 20

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Martin_H • 10 Jan 2025 18:23

Lifespan of a Biofire Fireplace?

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Tangolady•9 Jun 2024 11:10

Answers: 4

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Biofire Schwei • 4 Jan 2025 04:51

Materials for plumbing, heating, and related systems

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Haus_käufer•3 Jan 2025 16:45

Answers: 3

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Harakiri • 3 Jan 2025 17:13

Heat pump combined with Brötje NEO 18 B, 16 kW (hybrid system)

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DIRAHRAV•1 Jan 2025 20:31

Answers: 4

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DIRAHRAV • 1 Jan 2025 23:30

Which tools are recommended for roof cleaning?

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frankmehlhop•1 Jan 2025 22:58

Answers: 0

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frankmehlhop • 1 Jan 2025 22:58

Dimplex Heat Pump: Outdoor Temperature Issue

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bspire2024•27 Dec 2024 21:56

Answers: 4

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bspire2024 • 29 Dec 2024 21:12

KfW 40 house with a 10 kW wood stove—too large or appropriate?

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PMW1993•22 Dec 2024 13:38

Answers: 19

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Arauki11 • 25 Dec 2024 11:57

Question about the application for the climate speed bonus

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Thomas Seitz•22 Dec 2024 16:20

Answers: 3

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nordanney • 22 Dec 2024 16:56

Air Conditioner: Daikin or Mitsubishi?

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philipp1990•19 Dec 2024 20:57

Answers: 5

lastdrop • 20 Dec 2024 21:50

Sludge Separator / Air Separator

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Prager91•17 Dec 2024 09:29

Answers: 6

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nordanney • 17 Dec 2024 11:14

Final Purchase Decision Heat Pump: Panasonic WDG07LE5

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Newbi23•14 Dec 2024 09:48

Answers: 1

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nordanney • 14 Dec 2024 11:44

Unheated Basement – Adding a Heating System

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AndreSc•12 Dec 2024 03:14

Answers: 1

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Arauki11 • 12 Dec 2024 11:26

Central ventilation system for residential buildings in renovation projects

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steffen86•3 Dec 2024 09:15

Answers: 2

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steffen86 • 3 Dec 2024 09:47

60-65% Humidity in Living Room and Open-Plan Kitchen – Experiences

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Prosinecki•27 Nov 2024 08:49

Answers: 5

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Benutzer 1001 • 3 Dec 2024 08:31

Heat Pump: Which Type Makes Sense? (Viessmann Vitocal 250-A?)

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Newbi23•15 Nov 2024 19:44

Answers: 9

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nordanney • 2 Dec 2024 14:37

Underfloor Heating in Vacation Homes: Pros and Cons

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Haus_käufer•2 Dec 2024 01:04

Answers: 6

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nordanney • 2 Dec 2024 11:42

Sizing of Heat Pumps (Wide Variability on Online Platforms)

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Newbi23•2 Dec 2024 05:00

Answers: 2

Nida35a • 2 Dec 2024 09:16

Suitable Heating Concept for a KfW 40 Energy-Efficient House?

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Newbee-BW•30 Nov 2024 18:20

Answers: 17

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Newbee-BW • 1 Dec 2024 21:26

Underfloor heating warm even when turned off – cold even when turned on

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chrbrnr•20 Nov 2024 22:19

Answers: 7

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chrbrnr • 29 Nov 2024 21:19

Mechanical ventilation with heat recovery including dehumidification – which manufacturer do you recommend?

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grivel99•28 Nov 2024 16:29

Answers: 2

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Peter_H_ • 28 Nov 2024 18:58