Retrofitting a Mechanical Ventilation with Heat Recovery (MVHR) system into an old house can be challenging due to structural constraints and pre-existing infrastructure but it is not impossible. Here are 10 points to consider along with potential problems and solutions:
1. Assessment of Existing Infrastructure
Problem: Older houses may lack suitable ductwork or space for ventilation systems.
Solution: Before you start your project, conduct a thorough assessment of the existing layout and identify areas for potential ductwork installation. Consider alternative ducting options like surface-mounted ducts or space-saving designs.
2. Building Envelope Leakage
Problem: Older houses tend to have more air leakage through cracks and gaps in the building envelope, reducing the efficiency of the MVHR system.
Solution: Conduct air sealing measures such as caulking, weather stripping and insulation upgrades to minimise air leakage and optimise the performance of the MVHR system.
3. Balancing Airflows
Problem: Achieving balanced airflow distribution throughout the house can be challenging in older properties with irregular layouts.
Solution: Use adjustable vents and dampers to fine-tune airflow distribution and consider installing booster fans in areas with poor ventilation.
4. Noise and Vibration
Problem: MVHR systems can generate noise and vibration, which may be more noticeable in older houses with thinner walls and floors.
Solution: Select MVHR units with low noise and vibration levels, install vibration isolators and consider soundproofing measures such as acoustic insulation to minimise noise transmission.
5. Energy Efficiency
Problem: Older houses often have poorer insulation and thermal performance, impacting the energy efficiency gains of an MVHR system.
Solution: Upgrade insulation levels in walls, windows, floors and roofs to reduce heat loss and enhance the overall energy efficiency of the property.
6. Integration with Heating Systems
Problem: Integrating the MVHR system with existing heating systems such as boilers or radiators can be complex.
Solution: Ensure compatibility between the MVHR system and existing heating equipment and consider options like pre-heating or post-heating coils within the MVHR unit to optimise energy recovery.
7. Maintenance Access
Problem: Limited access for maintenance and servicing of the MVHR system components.
Solution: Design the installation with easy access points for filter replacement, duct cleaning, and maintenance tasks. Consider installing access panels in strategic locations.
8. Condensation and Moisture Control
Problem: Condensation can occur within ductwork and ventilation components, leading to moisture-related issues such as mould and mildew growth.
Solution: Use insulated ductwork to minimise condensation, incorporate condensate drains and ensure adequate ventilation in moisture-prone areas like bathrooms and kitchens.
9. Control and Monitoring
Problem: Limited control and monitoring capabilities in older houses.
Solution: Install modern control systems with user-friendly interfaces for managing airflow rates, temperature settings and monitoring indoor air quality parameters such as humidity and CO2 levels.
10. Compliance and Regulations
Problem: Compliance with building codes and regulations for retrofitting MVHR systems into old houses.
Solution: Work with experienced professionals familiar with local building codes and regulations, work from a comprehensive MVHR design plans, obtain necessary permissions and ensure that the installation meets safety and performance standards. By addressing these points carefully, homeowners can overcome the challenges associated with retrofitting MVHR systems into older houses and enjoy the benefits of improved indoor air quality and energy efficiency.
Should you have any further questions or would like some help with retrofitting your MVHR system, please either call 01892 600121 or email us on MVHR@epicair.co.uk and our experts will be delighted to help you
In the meantime, if you'd like to find out some additional information, then check out our blog about how an MVHR system works.
