How to Balance Heat Recovery Ventilation System

How to Balance Heat Recovery Ventilation System?

How to Balance Heat Recovery Ventilation System

Heat recovery ventilation systems must be balanced in order to ensure they are working to the maximum efficiency, that’s why in this blog we will share with you how to balance a heat recovery ventilation system.

With new buildings being made to be as energy efficient as possible, and the UK aiming for 95% of its electricity usage to be low carbon by 2030 it is imperative to understand how we can make the most of our ventilation, this is where heat recovery systems come in.

To prevent mould, fresh air should constantly be introduced into your dwelling daily, as it helps to regulate temperature and reduce condensation. Introducing fresh air can be as simple as having a ventilation routine, or installing extractors or heat recovery systems. Almost all of this is facilitated by ducting.

I-Sells is here to provide the answers you need whilst also supplying you with all the information you need to combat mould and have a well-ventilated home.

Heat recovery systems explained

A heat recovery system has the benefit of keeping your home energy efficient and warm, whilst maintaining ventilation. Heat recovery systems vary in size, some can be made just for a singular room, whilst others are made for your whole home.

The aim of a heat recovery system, aside from recovering any heat that is lost through ventilation, is to create an environment in which condensation, and consequently mould can’t survive in.

The advantages of heat recovery systems are the following:

  • Holds all the benefits of an extractor, this includes removal of stale air, humidity and smells.
  • The process of the heat recovery system results in an energy-efficient outcome, meaning that there is a possibility you can save money on energy bills in the long term.
  • It helps to prevent the cultivation of mould through the removal of humidity.
  • Temperature sensors ensure that additional heat is not being added to the atmosphere of the home if it is already hot.
  • Heat recovery systems take a lot of the burden from you conducting a ventilation routine. This is ideal for a vulnerable person.

Benefits of heat recovery systems

Here are some further benefits of having a heat recovery unit:

  • Less of a need to use your central heating frequently as the heat generated through your house is recycled through the heat recovery unit.
  • The recycling of indoor air without removal keeps the air fresh without having to lose any heat which is vital, especially in winter.
  • Helps to create an environment not fit for mould and condensation
  • The reduced use of heating as a result of the heat conservation granted by a heat recovery unit can help you save on energy bills.

How to balance heat recovery ventilation system

How to balance heat recovery ventilation system

Fresh air flow is a key factor in balancing your heat recovery ventilation system. The rooms that are used the most require higher ‘flow rates’, whereas smaller and lesser used rooms have a lower flow rate.

So, this means you should adjust the fresh air flow to be as close as possible to the extract total flow. Please bear in mind that if you aren’t an expert in this field, it is advisable to contact a HVAC service that can do this for you, alternatively, contacting us will ensure you will receive the correct guidance you need.

Why do heat recovery systems need balancing?

An imbalance in the heat recovery system can result in one room having more air extracted than another, or the efficiency of the unit being compromised, preventing it from working to its intended outcome.

Is a heat recovery system expensive to run?

In regard to the upcoming explanation, you must be aware that running costs will vary depending on the model you choose, and the amount you have active.

Here are the running costs from one of our smaller heat recovery systems, the Kair Heat Recovery Extractor Fan – 12VAC SELV – Humidistat (View product details here.) Here are the daily running costs.

The running costs based on average UK electricity costs as of April 2015 and an estimate of usage (Explained in explicit detail below) totals at roughly £0.04/day or £1.35/month.

Of course, running costs may have changed from household to household, whilst also factoring in the cost of living crisis, and more external factors. With that being said, the heat that is saved over time as a result of a heat recovery system more than makes up for the cost of running.

How loud are heat recovery systems?

Single-room heat recovery systems such as our Kair Heat Recovery Extractor Fan – 12VAC SELV – Humidistat have a decibel rating of 21- 45 decibels, which realistically is not enough to cause a disturbance.

When it comes to whole-house heat recovery systems, even though they are larger units they surprisingly are only nominally higher than their single-room counterparts. Take our Vent Axia Sentinel Kinetic B Boxed Whole House Heat Recovery Unit (438222), which has sound levels ranging from 22-49 decibels.

With whole house units, especially ones that continuously work, the benefit is that it will be in a loft space that nobody frequents, so any noise will be nominal. When it comes to single-room units, they generally are only on for a short period of time (depending on your settings) so again, this level of noise isn’t enough to disturb the neighbours, let alone yourself.

Do heat recovery systems kill mould?

Do heat recovery systems kill mould?

No, heat recovery systems do not directly destroy mould, if you already have mould in your home, having a heat recovery system will not make it disappear, you must address it by removing it, this can be done through mould removal products / addressing the cause of the mould.

That being said, heat recovery systems serve to prevent the environment necessary for mould to grow. Although it can’t kill mould, it can make sure the environment is not habitable for it.

Can I remove mould without a heat recovery system?

Yes, as we highlighted earlier, heat recovery systems change the environment that mould thrives on, it does not get rid of mould that is already there. Here are some options for mould removal.

Option 1: Natural Solutions

If you are looking for natural alternatives to get rid of mould, try using distilled white vinegar, the acidic properties in the vinegar helps to dissolve the mould. (This method may prove to be ineffective against a large collection of mould, so don’t rely on this method entirely.)

If there are noticeable and effective results, repeat until it is completely gone. If it fails, this means that the mould is penetrated deeper than surface level, if mould control solutions don’t make an improvement, it is best to call local mould cleaning services.

Option 2: Products

Mould removal products have special substances that prevent mould from coming back (depending on the severity) This is definitely worth a try especially if natural solutions didn’t work

Our solutions include

Contact I-Sells today

I-Sells - Contact us

We at I-Sells endeavour to ensure our customers have all the information they need before investing in our mould solutions. Be sure to visit our blog page to learn about the vast array of factors and issues surrounding ventilation, mould, condensation, and much more.

We hope to have shown you how to balance heat recovery ventilation system. We understand you may have more questions, Do not hesitate to contact us for more information about whatever you need our help with. If you’d like to send us an email, click here. For other contact options, see below:

Call us on 020 8463 9696

Visit us at our showroom:


Monday – Friday: 8:00 am to 5:30 pm

Saturday: 9:00 am to 12:00 pm

Sunday: Closed

15 St John’s Parade

Sidcup, Kent

DA14 6ES

United Kingdom

Share this post

Leave a Reply

Your email address will not be published. Required fields are marked *