ᐅ Heat Pumps / Ventilation Systems

Discover how heat pumps and ventilation systems can help you save energy and create a healthy indoor climate – learn what to consider when choosing and installing them!

Location of exhaust and supply air valves for the central ventilation system

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ChanceChip•24 Mar 2026 13:49

Answers: 1

Lüftermax • 12 May 2026 13:50

Ball bearing set of ten for Comfoair 350 / ebmpapst R3G220-AD01-07

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MayrCh•22 Apr 2026 19:35

Answers: 4

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MayrCh • 26 Apr 2026 09:32

Pluggit Avent P310: Water inside the unit – is a second drain hose advisable?

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kahless1A•21 Apr 2026 14:21

Answers: 2

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kahless1A • 21 Apr 2026 16:29

How would you decide? Heat pump and plumbing offer from Viessmann

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baulaie89•16 Apr 2026 14:37

Answers: 5

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nordanney • 19 Apr 2026 18:21

Location of the heat pump: mounted on the facade or installed on the ground?

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Bradyx86•1 Apr 2026 13:30

Answers: 3

tomtom79 • 2 Apr 2026 11:34

Blower door test before ventilation system installation

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Mosergmbh•30 Mar 2026 16:23

Answers: 0

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Mosergmbh • 30 Mar 2026 16:23

Which heat pump capacity is better: 4 kW or 6 kW – with EH40 large windows

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m0LN4rius•25 Feb 2026 18:27

Answers: 4

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nordanney • 25 Feb 2026 19:28

Wolf CWL 2 400 Surveying and Telephone Noise

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xander_v•2 Feb 2026 10:31

Answers: 0

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xander_v • 2 Feb 2026 10:31

Sealing the Supply and Exhaust Air of the Vallox ValloPlus 370 MV

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Häuschenbauer4•6 Jan 2026 07:21

Answers: 1

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Häuschenbauer4 • 18 Jan 2026 16:17

Panasonic WH-ADC0309K3E5 and WH-ADC0309K3E5AN

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Häuslebauer36•15 Jan 2026 16:38

Answers: 0

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Häuslebauer36 • 15 Jan 2026 16:38

Vallox ventilation system – question about the air outlet on the exterior wall

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Mennilein•11 Jan 2026 18:42

Answers: 2

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Mennilein • 11 Jan 2026 21:15

Ground Source Heat Pump: Bathroom on the Top Floor Too Cold – Is the Heat Distribution Incorrect?

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dassmoo•27 Dec 2025 15:47

Answers: 6

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dassmoo • 27 Dec 2025 18:50

Buffer tank quickly loses temperature during domestic hot water use

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Birdies•22 Dec 2025 16:40

Answers: 30

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Birdies • 26 Dec 2025 11:36

Planning Central Mechanical Ventilation in a KfW-55 House – Is Routing Ductwork from the Attic Practical?

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MaxMai25•15 Dec 2025 20:56

Answers: 1

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GeraldG • 16 Dec 2025 11:00

Ventilation Concept for a Single-Family Home: Natural Ventilation, Air Leakage Devices (ALDs), Door Gaps – What Are Your Thoughts?

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Sonar87•25 Nov 2025 22:37

Answers: 10

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sippen17 • 4 Dec 2025 10:31

Heat Pump for Renovating Older Buildings: System Setup, Domestic Hot Water, Buffer Tanks, and Ventilation?

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007sascha•20 Nov 2025 15:26

Answers: 8

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nordanney • 22 Nov 2025 09:40

Decentralized Ventilation Using Individual Units in a Single-Family Home

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JuLelle•19 Nov 2025 15:14

Answers: 18

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JuLelle • 20 Nov 2025 11:38

Decentralized exhaust ventilation system without heat recovery in KFW 40 new construction

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Cloud87•28 Sep 2025 17:58

Answers: 7

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sippen17 • 20 Nov 2025 09:39

Which manufacturer should I buy the heat pump and ventilation system combination from?

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Ohropax•20 Oct 2025 00:16

Answers: 19

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sippen17 • 20 Nov 2025 09:38

Controlled Residential Ventilation: Integrating an Insulated Attic into a Mechanical Ventilation System

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kletterbuxe•4 Nov 2025 13:07

Answers: 3

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sippen17 • 13 Nov 2025 08:21

Experiences with DWW - Aero²

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Kollo100•12 Nov 2025 19:47

Answers: 2

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nordanney • 13 Nov 2025 08:10

Arrangement of the heat pump indoor unit, building entry point, and hot water storage tank in the utility room

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jules_252•29 Oct 2025 15:30

Answers: 2

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ypg • 11 Nov 2025 13:49

Pluggit Control Board Defective – New Board Only Blinks | Pluggit AP310

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Sinus1986•14 Sep 2023 20:29

Answers: 1

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Nossie1984 • 7 Nov 2025 16:18

Air Heating System in a Kampa Prefabricated House, 2008

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marian_kassel•14 Sep 2025 20:37

Answers: 4

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marian_kassel • 7 Nov 2025 11:18

Cost-effectiveness Analysis of Heat Pump / Ice Storage / Photovoltaic Systems

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NorbT•28 Oct 2025 09:36

Answers: 9

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ajokr2025 • 28 Oct 2025 16:22

Are PVC ventilation ducts safe regarding harmful substances such as plasticizers?

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RealUnreal•22 Oct 2025 07:12

Answers: 10

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RealUnreal • 24 Oct 2025 20:43

Air Too Dry! – Should I Replace My Old Ventilation System with an Enthalpy Recovery Ventilation System?

Hendrik1980•12 Oct 2025 21:10

Answers: 22

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jehd • 14 Oct 2025 19:13

Decentralized ventilation units for larger rooms (older buildings)

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RealUnreal•1 Oct 2025 17:46

Answers: 23

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RealUnreal • 7 Oct 2025 16:36

New heat pump to replace oil heating with existing radiators

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strzata•27 Sep 2025 15:51

Answers: 60

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ajokr2025 • 2 Oct 2025 18:03

95mm Ventilation Fan Installed in Existing Intake Duct Due to Photovoltaic System

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tkleiber•17 Sep 2025 20:44

Answers: 0

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tkleiber • 17 Sep 2025 20:44

Air-to-water heat pump with cooling function – Is the additional cost justified?

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Forsberg21•15 Sep 2025 21:30

Answers: 6

Papierturm • 17 Sep 2025 19:51

Has the pipe insulation for the heat pump in the new build been properly installed?

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patalmtt•9 Sep 2025 21:18

Answers: 3

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patalmtt • 11 Sep 2025 19:46

Experiences with centralized ventilation systems in semi-detached houses?

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Alhtk24•13 Aug 2025 23:52

Answers: 4

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Alhtk24 • 17 Aug 2025 15:45

Ventilation, Heating, Cooling – Which Solution Is Future-Proof for Bien-Zenker?

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Jay_Kay•1 Jul 2025 21:47

Answers: 2

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Neuer von Da • 1 Jul 2025 22:31

Heat pump/ventilation system with excessive energy consumption

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Gintonik•24 Jun 2025 07:44

Answers: 25

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Gintonik • 26 Jun 2025 18:50

Combination of Heat Pump and Ventilation System – What to Consider?

LarsBr80•16 Jun 2025 12:36

Answers: 11

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Arauki11 • 26 Jun 2025 07:24

Advantages and Disadvantages of Different Ventilation Systems

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Olypen01•12 Jun 2025 09:10

Answers: 23

11ant • 16 Jun 2025 14:18

Central ventilation system located in the basement. Where should the supply air intake and exhaust air outlets be placed?

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GeraldG•15 Jun 2025 14:53

Answers: 0

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GeraldG • 15 Jun 2025 14:53

Is a ventilation system cost-effective? Does it save money?

LarsBr80•6 Jun 2025 11:28

Answers: 29

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motorradsilke • 12 Jun 2025 09:39

Drilling for a Vent - What Size?

LarsBr80•15 May 2025 11:50

Answers: 14

LarsBr80 • 6 Jun 2025 11:24

Ground Heat Exchanger Connected to Mechanical Ventilation with Heat Recovery in New Construction

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Romeostar•27 May 2025 15:54

Answers: 5

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Romeostar • 28 May 2025 22:00

Experience with Air Source Heat Pumps from Alpha Innotec

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Tilo BALZER•24 Sep 2024 23:06

Answers: 5

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Franke89 • 8 May 2025 11:31

Heat Pump Tariff & Blocked Hours – Requesting Opinions

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HilfeHilfe•28 Mar 2025 07:19

Answers: 21

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Yosan • 3 Apr 2025 13:39

Installation Tomorrow – Feedback on the Handover Checklist

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Newbi23•30 Mar 2025 17:55

Answers: 0

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Newbi23 • 30 Mar 2025 17:55

Current Installation Costs of a Heat Pump

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Yosan•25 Aug 2024 00:32

Answers: 58

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MachsSelbst • 7 Mar 2025 18:56

Heat Pump vs. Heat Pump with Domestic Hot Water Heat Pump

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ShanghaiTang•7 Mar 2025 09:38

Answers: 7

In der Ruine • 7 Mar 2025 17:51

In a central heat recovery ventilation system, is it possible or advisable to swap the supply and exhaust air connections?

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fatjacko_1•3 Mar 2025 15:53

Answers: 4

Mycraft • 4 Mar 2025 10:31

Split air conditioner – Which multisplit configuration?

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LostWolf•3 Feb 2025 13:20

Answers: 6

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LostWolf • 7 Feb 2025 09:01

KFN House Without a Ventilation System – Experiences

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Fabian3000•2 Feb 2025 11:53

Answers: 20

11ant • 4 Feb 2025 01:40

Dehumidifiers: When Is Using One Truly Beneficial?

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Baumer•30 Jan 2025 14:33

Answers: 5

In der Ruine • 3 Feb 2025 08:07

Is this wall penetration for the heat pump acceptable as shown?

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Jolo200000•16 Jan 2025 06:26

Answers: 3

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Hausenno • 17 Jan 2025 15:30

House for sale, currently with a broken heat pump

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Tobibi•11 Jan 2025 11:31

Answers: 7

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wiltshire • 12 Jan 2025 10:46

2. Is it worthwhile to have a separate meter for the heat pump? According to the calculations, yes—but is that really the case?

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Tx-25•7 Jan 2025 11:22

Answers: 13

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Neuer von Da • 7 Jan 2025 19:51

1980s Terraced House with Underfloor Heating – Heat Pump?

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leschaf•20 Dec 2024 20:10

Answers: 10

ateliersiegel • 6 Jan 2025 14:20

Centralized ventilation system ductwork entirely routed through the attic?

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oese123•27 Dec 2024 17:09

Answers: 8

tomtom79 • 27 Dec 2024 20:10

Condensation water in the ventilation system cannot drain properly.

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Tungsten•27 Dec 2024 11:07

Answers: 0

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Tungsten • 27 Dec 2024 11:07

Proper Adjustment of the Heat Pump in Combination with a Wood Stove

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Thomas.W•22 Nov 2024 16:55

Answers: 12

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Thomas.W • 2 Dec 2024 13:25

Heat pump noise issues – user experiences

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Nanoneo•12 Jan 2024 19:17

Answers: 13

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Nanoneo • 29 Nov 2024 22:00

Heat Pump Retrofit for a 30-Year-Old Multi-Family Residential Building?

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Heidi1965•28 Nov 2024 08:56

Answers: 1

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dertill • 28 Nov 2024 09:15

Scent distributed through a mechanical ventilation system with heat recovery. Does anyone have experience with this?

tomtom79•12 Aug 2019 15:27

Answers: 8

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Allthewayup • 10 Nov 2024 21:25

Proper Settings for an Integrated Air-to-Water Heat Pump for Beginners

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ringelstreifen•25 Oct 2024 21:13

Answers: 5

Tolentino • 27 Oct 2024 09:27

Air-to-air heat pump air conditioning? Comfort factor?

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UnfähigerBeamt•17 Oct 2024 02:29

Answers: 17

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dertill • 19 Oct 2024 22:27

Centralized or decentralized ventilation system

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Stefan1510•19 Oct 2024 19:18

Answers: 8

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Stefan1510 • 19 Oct 2024 22:05

Self-Built Filter Box for Mechanical Ventilation with Heat Recovery

OWLer•26 Feb 2024 16:41

Answers: 6

OWLer • 3 Oct 2024 22:19

Wolf ventilation system CWL-2 325 insufficient airflow amount

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Paradiddel•3 Sep 2024 21:59

Answers: 11

Mycraft • 3 Oct 2024 20:00

Renovation to KfW 85/70 Standard: Ventilation Including Cooling

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ApfelbaumHaus•2 Oct 2024 07:36

Answers: 2

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Rübe1 • 3 Oct 2024 08:33

Distance between exhaust vent and planned carport/roof structure

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stephan60•12 Sep 2024 11:02

Answers: 1

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RotorMotor • 12 Sep 2024 12:29

Which type of heat pump is suitable for an existing building?

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asaid10•11 Sep 2024 00:16

Answers: 11

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nordanney • 11 Sep 2024 12:54

Experiences with decentralized ventilation systems

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haus_bau2025•8 Sep 2024 17:06

Answers: 5

11ant • 9 Sep 2024 01:35

Ground Source Heat Pump Manufacturer: Bosch or Vaillant?

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bwollowb•22 Aug 2024 08:51

Answers: 0

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bwollowb • 22 Aug 2024 08:51

Recommendation: Panasonic Monoblock vs. Split System

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GDWE2023•20 Aug 2024 12:29

Answers: 1

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nordanney • 20 Aug 2024 13:14

Central ventilation system Vallox 350SC

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Tx-25•16 Aug 2024 18:52

Answers: 8

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Allthewayup • 17 Aug 2024 22:28

How effective are combined systems featuring heat pumps, solar panels, and energy storage?

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1840858•11 Aug 2024 08:33

Answers: 0

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1840858 • 11 Aug 2024 08:33

Wall penetration for heat pump in a timber frame exterior wall

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Barnhouse•8 Jul 2024 10:12

Answers: 3

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Harakiri • 9 Jul 2024 10:21

Best decentralized ventilation system for retrofit?

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braucheluft•15 Mar 2018 04:12

Answers: 2

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TorstenKandt • 3 Jul 2024 10:31

Is the Ventilation Rate According to Standard Values Unrealistic?

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Jimy3435•23 Jun 2024 18:07

Answers: 4

rick2018 • 26 Jun 2024 20:18

Is a Heat Pump Now More Expensive Than Gas Again?

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Teryamy•2 Jun 2024 10:26

Answers: 7

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Teryamy • 3 Jun 2024 16:56

Centralized vs. decentralized ventilation systems

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Swiffers14•3 Aug 2023 19:55

Answers: 34

OWLer • 22 May 2024 22:07

Installing Ventilation in a Toilet Room After Construction

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Swoti•19 May 2024 19:10

Answers: 0

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Swoti • 19 May 2024 19:10

Rental Apartment – Uncertainty Regarding Installed Decentralized Ventilation Systems

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fabianr•18 May 2024 10:25

Answers: 7

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ypg • 18 May 2024 15:45

Is it possible to combine district heating or local heating with an air heating system? New build

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Armbrust•18 May 2024 10:53

Answers: 6

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Rübe1 • 18 May 2024 15:18

NIBE Air-to-Water Heat Pump Options for the Indoor Unit

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LostWolf•16 May 2024 09:29

Answers: 3

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nordanney • 16 May 2024 10:10

Replace electric radiators with inverter air conditioning units

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DanielR•20 Apr 2024 08:17

Answers: 13

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DanielR • 27 Apr 2024 08:44

Solar panels and heat pump. Experience with heating four apartments?

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Andik81•15 Apr 2024 16:45

Answers: 3

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hanghaus2023 • 18 Apr 2024 11:06

Heat pump on the flat roof is making a loud humming noise

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Nik_Hamburg•3 Apr 2024 07:32

Answers: 14

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Rübe1 • 9 Apr 2024 08:11

Issues with Moisture in Older Homes

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bluetoothtony•7 Apr 2024 22:26

Answers: 7

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nordanney • 8 Apr 2024 20:13

Original vs. Replica: Central Ventilation Unit

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klausdieter73•3 Apr 2024 14:36

Answers: 1

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sysrun80 • 3 Apr 2024 23:14

Which brine-to-water heat pump: Viessmann, Nibe, or Stiebel WPE-I 10 H?

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Alrico1•10 Mar 2024 08:32

Answers: 12

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BobRoss • 31 Mar 2024 19:26

Heat pump and photovoltaic system despite oil heating from 2019?

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koelschejung99•24 Mar 2024 20:16

Answers: 3

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WilderSueden • 24 Mar 2024 20:45

Helios Power Consumption Controlled Residential Ventilation 300 vs. 360

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LostWolf•22 Mar 2024 06:48

Answers: 3

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LostWolf • 23 Mar 2024 11:42

Central Ventilation System Existing Planning

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LostWolf•21 Mar 2024 13:34

Answers: 0

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LostWolf • 21 Mar 2024 13:34

Helios Controlled Residential Ventilation System Commissioning Service

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LostWolf•16 Mar 2024 16:19

Answers: 0

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LostWolf • 16 Mar 2024 16:19

Wilo pump for the heating circuit is making noise.

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Eldirwars•12 Mar 2024 03:08

Answers: 0

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Eldirwars • 12 Mar 2024 03:08

Replacement filters for central residential ventilation systems made of coarse filter fleece, G2–G4 ratings

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cjfilter•11 Mar 2024 01:27

Answers: 7

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RotorMotor • 11 Mar 2024 14:49

Operation of the Wolf CWL 300 Central Ventilation Unit

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Jimy3435•9 Mar 2024 23:26

Answers: 3

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nordanney • 10 Mar 2024 13:26

Is a buffer tank useful for a heat pump?

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jx7•14 Feb 2024 15:05

Answers: 72

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jx7 • 5 Mar 2024 13:52

Heat pump humming depending on outdoor temperature

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andriy_melnyko•3 Mar 2024 14:56

Answers: 4

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andriy_melnyko • 5 Mar 2024 13:07

Costs for Heat Pumps and Photovoltaic Systems in Small Older Homes in 2024

Winniefred•29 Feb 2024 17:33

Answers: 20

Winniefred • 4 Mar 2024 11:20

Repair a heat pump for €5,000–7,500 or replace it with a new one?

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jx7•16 Feb 2024 16:32

Answers: 18

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jx7 • 28 Feb 2024 15:12

What size hot water storage tank is needed with a heat pump?

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BackSteinGotik•20 Feb 2024 12:09

Answers: 15

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nordanney • 27 Feb 2024 19:03