MVHR Installation & Heat Recovery Systems Sussex
Energy-efficient ventilation for healthier indoor environments across Sussex
Expert MVHR Heat Recovery Installation
At Ernest Air Cooling, we specialise in professional MVHR (Mechanical Ventilation with Heat Recovery) systems across Sussex. Our energy-efficient solutions provide continuous fresh air while recovering up to 90% of heat, costing just £40-£60 per year to run. Modern MVHR units operate at just 25-30dB in living spaces—quieter than a library—while dramatically reducing heating costs by 15-30% and improving indoor air quality.
Whether you're building a new home or retrofitting an existing property, our expert engineers design and install custom MVHR systems. These eliminate condensation, prevent mold growth, and create healthier living environments. We work with leading manufacturers to deliver reliable, whisper-quiet systems that complement our air conditioning installations and ventilation system services.
What We Offer:
- Up to 90% Heat Recovery
Advanced heat exchangers that capture and reuse thermal energy from extracted air
- Premium MVHR Brands
Certified installer for Nuaire, Vent-Axia, Zehnder and other leading manufacturers
- Custom System Design
Tailored MVHR solutions for new builds and retrofit installations
- Complete Service Package
From design and installation to commissioning and ongoing maintenance
Comprehensive MVHR Services
From initial design to ongoing maintenance, we provide complete heat recovery solutions
Installation Services
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New Build MVHR
Complete MVHR systems designed and installed during construction for optimal integration
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Retrofit Solutions
Carefully planned MVHR installations for existing properties with minimal disruption
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Commercial MVHR
Large-scale heat recovery systems for offices, schools, and commercial buildings
Support & Maintenance
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System Commissioning
Full testing, balancing and optimisation for maximum heat recovery efficiency
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Regular Servicing
Scheduled maintenance including filter removal, disposal and fitting every 6-12 months, performance checks, and system optimisation. Our MVHR maintenance packages start from just £95/year. Replacement filters are quoted separately as costs vary by unit.
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System Repairs
Expert repairs and component replacement for all MVHR brands and models
MVHR vs MEV vs PIV: Which System Is Right for You?
Understanding the three main ventilation systems helps you choose the best solution for your home
| Feature | MVHR | MEV | PIV |
|---|---|---|---|
| How It Works | Supplies and extracts air via ducting with a heat exchanger | Extracts stale air only; fresh air enters via trickle vents | Pushes filtered air in from the loft; stale air exits via gaps |
| Heat Recovery | Up to 90% | None | None (some units have a small heater) |
| Air Filtration | Yes — filters pollen, dust & pollution from incoming air | No — unfiltered air enters through trickle vents | Basic — filters loft air before distribution |
| Installation Cost | £4,000 – £8,000 | £1,000 – £2,500 | £500 – £1,500 |
| Running Cost | £40 – £60 / year | £20 – £40 / year | £20 – £40 / year |
| Heating Bill Savings | 15 – 30% | None | None |
| Noise Level | 25 – 30 dB | 25 – 35 dB | 30 – 40 dB |
| Best For | Well-insulated homes, new builds, airtight properties, allergy sufferers | Older homes, budget installations, less airtight properties | Condensation problems in older homes, quick and low-cost fix |
| Building Regs | Meets Part F & Part L for new builds | Meets Part F minimum | May not meet Part F for new builds |
MVHR Recommended
How it works: Supplies and extracts air via ducting with a heat exchanger
Heat recovery: Up to 90%
Air filtration: Yes — filters pollen, dust & pollution
Install cost: £4,000 – £8,000
Running cost: £40 – £60 / year
Heating savings: 15 – 30%
Best for: Well-insulated homes, new builds, allergy sufferers
MEV
How it works: Extracts stale air only; fresh air enters via trickle vents
Heat recovery: None
Air filtration: No — unfiltered air via trickle vents
Install cost: £1,000 – £2,500
Running cost: £20 – £40 / year
Heating savings: None
Best for: Older homes, budget installations
PIV
How it works: Pushes filtered air in from the loft; stale air exits via gaps
Heat recovery: None (some have a small heater)
Air filtration: Basic — filters loft air
Install cost: £500 – £1,500
Running cost: £20 – £40 / year
Heating savings: None
Best for: Condensation problems in older homes, quick fix
Our Recommendation
For most modern and well-insulated Sussex homes, MVHR is the best long-term investment. While the upfront cost is higher than MEV or PIV, the 15-30% saving on heating bills means MVHR typically pays for itself within 5-8 years — while providing superior air quality, filtration, and comfort every day.
PIV can be a good quick fix for condensation and damp in older properties, and MEV meets minimum building regulations at a lower cost. However, neither recovers heat or filters incoming air the way MVHR does. If you're unsure which system suits your home, get in touch for a free assessment — we'll recommend the right solution based on your property, budget, and goals.
Is My Home Suitable for MVHR?
MVHR works in more property types than most people think. Here's an honest breakdown for common Sussex homes.
New Builds
Ideal for MVHR
New builds are airtight by design, making MVHR the natural choice. Building Regulations Part F and Part L strongly favour MVHR in new construction. Ducting can be planned into the build from day one, keeping costs down and installation clean.
Victorian & Edwardian Terraces
Suitable with assessment
Many Sussex terraces have been draught-proofed and insulated over the years, creating the airtight conditions where MVHR excels. Ducting typically runs through the loft or first-floor ceiling void. If your home still has original single-glazed sash windows and open fireplaces, improving airtightness first will give the best results.
1930s Semi-Detached
Suitable with assessment
These well-built homes are excellent MVHR candidates once cavity wall insulation and double glazing are in place. Good loft access makes ducting straightforward. These are some of the most common homes we retrofit MVHR into across Sussex.
Bungalows
Suitable — often easier than expected
Bungalows with loft space are actually straightforward for MVHR because all ducting runs directly through the loft above each room. Even bungalows with solid concrete floors (common in post-war Sussex coastal areas) work well, as ducting doesn't need to go through floors at all.
Modern Flats & Apartments
Ideal for MVHR
Post-2006 flats are built to airtight standards and many already have MVHR installed. If yours has a failed or noisy system, we specialise in replacing and upgrading MVHR in Sussex new-builds. Compact units fit in utility cupboards where space is limited.
Listed Buildings
Challenging — needs specialist approach
Listed buildings in conservation areas may need planning consent for external grilles. However, solutions exist: discreet vent positions, heritage-sympathetic grilles, and careful routing can make it work. We'll advise on what's feasible and handle any planning requirements for you.
What Makes MVHR Work Well?
Airtightness
The more airtight your home, the better MVHR performs. Homes with double/triple glazing, sealed draughts, and good insulation get the most benefit. We can advise on any improvements worth making first.
Space for Ducting
You need a route for ducting — usually through the loft, ceiling void, or bulkheads. The MVHR unit itself is roughly the size of a small boiler and sits in a loft, utility room, or cupboard.
External Wall Access
Two 150mm holes through an external wall are needed for the supply and exhaust. These are discreet and can be positioned to minimise visual impact. We always discuss placement with you before drilling.
Not sure if MVHR will work in your home? We offer free, no-obligation assessments across Sussex.
Book a Free Assessment
A complete MVHR installation in a loft in Small Dole, West Sussex — Vent-Axia unit with distribution manifold and semi-rigid ducting runs to each room.
How Much Does MVHR Cost to Run?
MVHR is one of the cheapest home systems to run — and it actually saves you money overall
Electricity Cost
£40 - £60
per year to run
MVHR units typically draw 20-40 watts on normal speed — about the same as a standard light bulb running continuously. At 24p/kWh, that's roughly £1/week.
Heating Bill Savings
15 - 30%
reduction in heating costs
By recovering up to 90% of heat from extracted air, MVHR pre-warms incoming fresh air. For a typical Sussex home spending £1,200/year on gas, that's £180-£360 saved annually.
Net Saving
£120 - £300
net saving per year
After subtracting the £40-60 electricity cost, most MVHR owners are £120-£300 per year better off. Filter costs (£15-£30 every 6-12 months) are the only other expense.
Payback Period
With an average net saving of £150-£250 per year and a typical installation cost of £4,000-£8,000, most MVHR systems pay for themselves within 5-8 years. After that, the savings continue for the 15-25 year lifespan of the unit. Factor in the elimination of damp-related repair costs (repainting, mould treatment, replacing damaged plaster) and the payback is even faster.
Close-up of the Vent-Axia unit connections — sealed supply and extract ducts ensuring no air leakage and maximum heat recovery efficiency.
MVHR Health Benefits
Better air quality means better health. Here's what MVHR does for the people living in your home.
Reduces Asthma & Allergy Triggers
MVHR filters remove pollen, dust, and airborne particles from incoming air. For the 5.4 million asthma sufferers in the UK, filtered air can significantly reduce symptom frequency and severity.
Eliminates Mould & Damp
By continuously extracting humid air from bathrooms and kitchens, MVHR prevents the condensation that leads to black mould. Mould exposure is linked to respiratory infections, particularly dangerous for children and the elderly.
Better Sleep Quality
Fresh air circulation overnight means lower CO2 levels in bedrooms. Studies show that bedroom CO2 above 1,000ppm affects sleep quality and next-day cognitive performance. MVHR keeps levels well below this threshold without needing to open windows.
Filters Outdoor Pollution
For homes near busy roads, MVHR filters particulate matter and pollutants from incoming air — something you simply can't achieve by opening windows. Particularly beneficial along the A27 and A259 corridors across Sussex.
Reduces Radon Exposure
Parts of Sussex have naturally occurring radon gas. MVHR's continuous ventilation dilutes radon concentrations, reducing this invisible health risk that Public Health England identifies as the second leading cause of lung cancer in the UK.
No Draughts or Street Noise
Unlike opening windows, MVHR provides fresh air without cold draughts, street noise, insects, or security concerns. Your home stays comfortable, quiet, and secure while getting a complete air change every 2-3 hours.
Industry-Leading MVHR Systems
We install and service premium heat recovery equipment from trusted manufacturers
As certified installers for these leading MVHR manufacturers, we provide extended warranties and expert technical support for all our heat recovery installations throughout Sussex and the South East. Our team regularly undergoes manufacturer training to ensure we deliver the most energy-efficient and reliable ventilation solutions.
What Our Clients Say About Our MVHR Systems
"We had a MVHR system installed providing fresh air to four bedrooms in our house. The installation was challenging as the space in our loft was limited, but Tim managed it perfectly."
Phillip Redwood
Residential Customer, Sussex
"Fantastic job all round by Tim. I would highly recommend. Professional, honest and very thorough…the new MVHR system is fantastic and does exactly what I wanted. A real star."
Jason Hughes
Homeowner, Brighton
Frequently Asked Questions
Common questions about MVHR heat recovery systems in Sussex
What is MVHR and how does it work?
MVHR (Mechanical Ventilation with Heat Recovery) systems extract stale, humid air from kitchens, bathrooms and utility areas. They recover the heat before expelling it. The system then draws in fresh air from outside. It passes this air through the heat exchanger to warm it with the recovered heat. Finally, it distributes this fresh, filtered air throughout your property. Modern MVHR systems can recover up to 90% of heat that would otherwise be lost. This significantly improves energy efficiency while ensuring a constant supply of fresh, filtered air.
Is MVHR suitable for existing homes in Sussex?
Yes, while MVHR is often installed in new builds, we specialise in retrofit installations across Sussex homes. Our team carefully assesses your property to determine the most effective installation approach. We consider factors like property age, construction type, and existing ventilation. This helps us design a system that works efficiently. Retrofitting MVHR is particularly beneficial for homes that have been insulated to modern standards. These can suffer from poor ventilation and condensation issues that MVHR effectively resolves.
How much does MVHR installation cost in Sussex?
MVHR installation costs in Sussex typically range from £4,000-£8,000 for an average home. This depends on property size, system complexity, and whether it's a new build or retrofit. The price includes the unit, ducting, vents, controls, and professional installation. While this represents an initial investment, many homeowners see returns through reduced heating bills (typically 15-30% savings). You also get improved air quality and elimination of condensation-related maintenance costs. We provide detailed, transparent quotes following a thorough on-site assessment.
Can MVHR be used with air conditioning?
Absolutely. MVHR and air conditioning systems complement each other perfectly. MVHR handles ventilation, ensuring fresh air circulation and recovery of heat. Air conditioning manages temperature control. When integrated professionally, these systems work together to create optimal indoor comfort with maximum energy efficiency. We specialise in designing integrated climate solutions. MVHR provides continuous fresh air while reducing the workload on your heating and cooling systems. This results in better performance, lower running costs, and improved air quality.
How much does MVHR cost to run per year?
An MVHR system typically costs between £40-£60 per year in electricity to run—roughly the same as a standard light bulb left on continuously. This modest running cost is far outweighed by the 15-30% savings on heating bills that the heat recovery provides, making MVHR a net money-saver for most households.
Is MVHR noisy?
Modern MVHR systems are designed to be very quiet. The main unit is typically installed in a loft or utility area, and with proper duct sizing and acoustic attenuators, noise levels in living spaces are typically 25-30dB—comparable to a quiet bedroom at night. Building Regulations require no more than 30dB in bedrooms and 35dB in kitchens and bathrooms. We commission every system to meet these standards.
How often do MVHR filters need changing?
MVHR filters should be checked every 3-6 months and replaced every 6-12 months, depending on your location and local air quality. Replacement filters typically cost £15-£30 per set. Regular filter changes are essential to maintain airflow, system efficiency, and indoor air quality. Our maintenance packages include filter removal, disposal and fitting — replacement filters are quoted separately as costs vary by unit.
How long does MVHR installation take?
For a new build, MVHR is installed in stages alongside the construction, adding no extra time to the overall build. For retrofit installations in existing homes, a typical system takes 3-5 days to install, including fitting the unit, running ducting through the loft or ceiling void, installing supply and extract valves, and full commissioning. We plan the work carefully to minimise disruption to your home.
What is the difference between MVHR, MEV and PIV?
MVHR supplies and extracts air via ducting, recovering up to 90% of heat and filtering incoming air — it's the most comprehensive solution. MEV (Mechanical Extract Ventilation) only extracts stale air from wet rooms and relies on trickle vents for fresh air — no heat recovery or filtration. PIV (Positive Input Ventilation) pushes filtered air from the loft into the home, which can help with condensation, but offers no heat recovery. MVHR costs more to install (£4,000-£8,000) but saves 15-30% on heating bills, making it the best long-term choice for well-insulated homes. See our full comparison table above.
Does MVHR work in summer?
Yes. In summer, most MVHR units have a bypass mode that automatically opens when outdoor air is cooler than indoor air (typically during evenings and overnight). This allows cool fresh air to enter without passing through the heat exchanger, providing free cooling. During hot days, the system continues to ventilate and filter incoming air. For active cooling, MVHR works perfectly alongside air conditioning.
Can I install MVHR myself?
While there's no legal requirement for a specific qualification, DIY MVHR installation is not recommended. Poor duct design, incorrect sizing, or bad commissioning will result in a noisy, inefficient system that doesn't meet Building Regulations. Professional design ensures correct air flow rates, proper duct sizing to minimise noise, and compliant commissioning. A badly installed system often costs more to fix than it would have cost to install properly in the first place.
How long does an MVHR system last?
A quality MVHR unit from manufacturers like Nuaire, Vent-Axia, or Zehnder typically lasts 15-25 years with proper maintenance. The heat exchanger has no moving parts and can last the lifetime of the building. Fans and motors may need replacement after 10-15 years, which is a straightforward service job. Regular filter changes and annual servicing are the key to long system life — our maintenance packages cover everything.
MVHR Insights & Projects
MVHR Installation in a Bespoke Eco Home
Complete Nuaire MVHR system installed in a custom eco-build in Pulborough.
MVHR Issues & Solutions in New-Build Flats
Common MVHR problems in new builds and how we fix them.
Single-Room Ventilation & dMVHR
Decentralised MVHR with remote monitoring for targeted ventilation.
Ready for Professional MVHR Heat Recovery in Sussex?
Whether you're building a new home or retrofitting an existing property, our expert team is ready to design and install the perfect MVHR system to reduce your heating costs and improve indoor air quality.