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An airtight home still needs deliberate ventilation. Airtightness stops uncontrolled draughts and reduces heat loss; it does not remove humidity, cooking pollutants, carbon dioxide or other indoor contaminants. In a heating climate, the most reliable low-heat-loss approach is usually a correctly designed mechanical system—often mechanical ventilation with heat recovery (MVHR) where the dwelling can accommodate it—combined with openable windows for purge ventilation and occupant control. The right solution depends on the building, its layout, local regulations and the way it is occupied.
Why does an airtight home need ventilation?
Airtightness and ventilation solve different problems. Sealing gaps in the envelope limits uncontrolled air leakage, improving comfort and reducing energy loss. Ventilation deliberately replaces stale indoor air with outdoor air and removes moisture and pollutants. A tight home can therefore have excellent energy performance and poor indoor air quality if its ventilation is inadequate.
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What is the best ventilation strategy for an airtight home?
Start with a whole-building plan rather than choosing a fan or sealing another gap. The plan should provide continuous or scheduled background ventilation, rapid removal of moisture and pollutants at source, a path for air to move between rooms, and a way to purge a room quickly when needed.
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- Supply air: outdoor air enters habitable rooms such as bedrooms and living rooms.
- Transfer paths: air moves through internal door undercuts or transfer grilles toward wet rooms. Do not block these paths with airtight seals.
- Extract air: stale, moist air leaves from kitchens, bathrooms, utility rooms and toilets. Fans and ducts must discharge outdoors, never into a loft, wall cavity or roof void.
- Purge ventilation: openable windows or louvres allow a rapid flush after cooking, cleaning, decorating or an unusually hot day.
NICE recommendations on indoor air quality call for heating and ventilation to be considered together, with source control and filtration where appropriate. That is more dependable than relying on random cracks or asking occupants to open windows whenever humidity rises.
Can I ventilate an airtight home by opening windows?
Yes, window opening provides useful fresh air and purge ventilation, but it is a poor sole strategy if the aim is consistent air quality with low winter heat loss. It depends on weather, wind, noise, security and whether occupants remember to open and close windows. In cool weather, replacing heated indoor air with unheated outdoor air increases the heating load; Health Canada’s overview of residential ventilation describes this trade-off.
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1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minuteKeep windows or louvres that occupants can open where appropriate. UK Healthy Homes guidance identifies openable windows as useful for fresh air and purge ventilation even when high-efficiency MVHR is installed. Use short, deliberate airing rather than leaving windows tilted all winter, and close them once the room has been flushed. Window ventilation remains valuable during a power failure or when a mechanical system is being serviced.
How does MVHR reduce heat loss?
MVHR uses two air streams. A fan supplies filtered outdoor air to living spaces while another extracts warm, humid air from wet rooms. A heat exchanger transfers heat from the outgoing stream to the incoming stream without mixing the airstreams. The incoming air is therefore warmer than outside air, while moisture and pollutants are carried outdoors.
MVHR is not a magic efficiency number. Delivered performance depends on the unit, duct design, airtightness, commissioning, filter condition, controls and operating conditions. Avoid selecting a system from an advertised recovery percentage alone. England’s 2026 edition of Approved Document F, Volume 1 includes guidance for both centralised and decentralised mechanically driven supply-and-extract systems.
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A centralised system normally needs space for the unit and ducts, with terminals carefully positioned and balanced. A decentralised approach may use separate room units and can be more practical where long duct runs are impossible, but the design still has to address noise, airflow and maintenance. Neither arrangement is automatically suitable for every retrofit.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallWhich ventilation options should be considered?
| Approach | Strengths | Limitations and checks |
|---|---|---|
| Window-based natural ventilation | Simple, no fan or duct maintenance, direct occupant control and useful purge ventilation. | Inconsistent; affected by weather and behaviour; winter airing can waste heat and may not remove moisture reliably. |
| Intermittent or continuous extract | Targets kitchens and bathrooms and can be economical to install, particularly in smaller projects. | Replacement air must enter somewhere. Unheated incoming air can cause discomfort and energy use; fans must discharge outdoors. |
| Balanced MVHR | Supplies and extracts air mechanically while transferring heat; filtration can help where outdoor pollution is a concern. | Needs suitable routes, careful design, commissioning, filter replacement and ongoing power and maintenance. |
| Other supply, exhaust or balanced systems | Can be matched to a home’s construction, occupants and budget when MVHR is impractical. | Not all recover heat. Selection must account for climate, controls, noise, air quality and applicable standards. |
Compare proposals on ventilation adequacy, heat and electricity use, ducting feasibility, outdoor pollution and filtration, noise, controls, maintenance access and the regulations applying to the project. These are decision criteria, not a guarantee that one system wins every category.
How should ventilation be designed during a new build?
- Set the airtightness and ventilation objectives together. Coordinate the envelope, heating, hot-water equipment and ventilation before construction details are fixed. Do not treat ventilation as an afterthought once ceilings and service zones are closed.
- Map rooms and airflows. Mark supply terminals in habitable rooms, extract points in wet rooms and transfer paths between them. Keep ducts as short and straight as practical, with space for insulation, access and cleaning.
- Plan pollutant source control. Provide effective kitchen and bathroom extraction. A cooker hood or extract fan should discharge outdoors; recirculating filters alone do not remove moisture.
- Address outdoor air quality. Place intakes away from exhaust outlets and obvious pollution sources. Where traffic or other pollution is significant, ask the designer whether filtration and its replacement schedule are appropriate.
- Coordinate terminals and acoustics. Avoid locations where furniture, curtains or storage will block airflow. Specify low-noise operation and provide access to the unit, filters, fans and fire or acoustic components.
- Commission before handover. Airflows, controls, boost modes and terminal settings should be measured and adjusted against the design and manufacturer’s instructions. Request the commissioning record and user guidance.
NICE recommends compliant installation and commissioning, while national requirements differ. In England, use the applicable Approved Document F edition for the work. Scotland has its own technical handbook and standards; other jurisdictions have their own rules.
How can an existing airtight home be retrofitted?
Do not assume that adding an MVHR unit is the answer. A retrofit assessment should examine the home’s layout, current airtightness, moisture symptoms, available service routes, ceiling heights, external air quality, electrical supply and the scope of any insulation or window work.
- Investigate symptoms and sources. Record condensation, mould, persistent odours and rooms that feel stuffy. Check whether bathroom and kitchen fans actually discharge outdoors and whether grilles or filters are blocked.
- Review the envelope and combustion appliances. Sealing work can alter pressure and air paths. Obtain competent advice where open-flued heaters, fireplaces or other combustion appliances remain.
- Choose the least disruptive system that meets the need. A well-designed extract system may suit a compact dwelling; a balanced heat-recovery system may suit a sufficiently airtight home with workable duct routes. Room-by-room decentralised units can be considered where a central network cannot be routed.
- Protect serviceability. Leave access for filters, fans, condensate management, controls and duct inspection. A system that cannot be maintained will not deliver its designed performance.
- Recommission after building changes. New windows, insulation, partitions or kitchen and bathroom alterations can change airflow. Recheck the system rather than assuming the original settings remain correct.
The title alone cannot establish retrofit suitability. Have a competent ventilation professional assess the property and identify the regulations and approvals required locally.
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How should an airtight home be operated day to day?
- Run background ventilation at the designed setting; do not switch it off permanently to save a small amount of electricity.
- Use boost extraction while showering and cooking, and leave it running for the designed overrun period afterward.
- Keep internal transfer paths clear and do not cover supply or extract grilles.
- Use open windows for short purge periods or comfort, then close them when the need has passed.
- Do not dry large amounts of laundry without providing the ventilation the room requires.
- Keep filters clean and replace them with the type and at the interval specified for the installed unit. A dirty filter raises resistance and can reduce airflow.
- Learn the controller’s normal, boost and holiday settings, and keep the commissioning and maintenance information with the home records.
What common mistakes waste heat or damage indoor air quality?
Sealing vents to stop draughts
Blocking trickle vents, grilles or extract points can reduce the designed airflow and trap moisture. Fix the cause of discomfort—poor placement, excessive fan noise or an unbalanced system—instead of disabling ventilation.
Exhausting into a roof or cavity
Warm, wet air discharged into a loft or wall can condense within the structure. Confirm that every extract duct terminates outdoors and that its route, insulation and weather termination are suitable.
Installing an oversized or poorly routed MVHR system
Long, convoluted or crushed ducts increase resistance and noise. A unit selected without an airflow calculation may run inefficiently or fail to deliver air where it is needed. Design and commissioning matter as much as the equipment label.
Ignoring filtration and maintenance
Filters can help limit incoming particulates, but they load up and need replacement. Ask what filter grade the design calls for, how often it should be changed and what access is required.
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Lowering airflow can make the home feel warmer temporarily while allowing humidity and pollutants to accumulate. Use the designed settings and improve the building or system design if comfort and energy performance conflict.
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How do you know whether the system is working?
Comfort alone is not a reliable test. Persistent condensation on windows, mould, lingering bathroom humidity, odours that spread through the home, unusual fan noise or rooms that remain stuffy warrant investigation. Check controller settings, filter condition, blocked terminals and whether fans discharge outdoors. If those checks do not resolve the issue, ask the installer or an independent competent professional to measure airflows and inspect the ductwork.
Keep records of commissioning readings, filter changes and any alterations to the envelope. Those records help diagnose a problem and are particularly useful when a home changes ownership.
Which rules apply to airtight-home ventilation?
Requirements depend on location, building type and the work being carried out. England’s 2026 Approved Document F, Volume 1, addresses dwellings and includes centralised and decentralised mechanically driven ventilation guidance. Scotland’s domestic technical handbook has separate provisions, and other countries use different codes. Building-control approval, planning conditions, fire safety, electrical work and appliance-safety rules may also apply.
Use the edition in force when the work is approved, not an old installation leaflet found online. Ask the designer or building-control body what documents, tests and commissioning evidence are required for the specific project.
What is the practical answer for most airtight homes?
Keep the envelope airtight, but provide deliberate ventilation sized and balanced for the dwelling. Retain openable windows for purge ventilation and occupant choice; use source extraction for kitchens and bathrooms; and consider MVHR when the home’s airtightness, layout and budget make a properly designed balanced system feasible. Have the installation commissioned, maintain filters and fans, and never trade away required ventilation merely to reduce heat loss.
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Frequently Asked Questions
Should windows stay open all day in an airtight house?
Usually not. Short purge airing is useful, but leaving windows open continuously can undermine heat retention and makes ventilation dependent on weather and behaviour. Use the home’s designed background system, with windows opened when occupants need rapid fresh air or cooling.
Do airtight homes need trickle vents?
It depends on the ventilation design and local requirements. Trickle vents may form part of a natural or extract strategy, but a balanced system may use dedicated supply terminals instead. Never remove or seal vents without confirming that the replacement airflow has been designed and approved.
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Can an MVHR system remove cooking smells completely?
No system guarantees instant removal. Use a correctly sized kitchen extract arrangement, operate boost while cooking and keep filters and terminals maintained. Strong or persistent smells can indicate poor capture, blocked ductwork or incorrect commissioning.
How often should MVHR filters be changed?
Use the interval in the installed unit’s manual and shorten it if the outdoor air is dusty or polluted. Inspect filters regularly; a visibly loaded filter should not be left in service until the nominal date. Record each change so maintenance is not missed.
Is heat recovery ventilation worthwhile in a retrofit?
It can be, but only after checking airtightness, available duct routes, room arrangement, noise, electrical supply and maintenance access. A professional assessment may find that a different extract or supply arrangement delivers the required air quality with less disruption.
