Do MVHR Dry the Air Out?

Do MVHR Dry the Air Out?

For anyone interested in the HVAC sector, you will know that humidity is something to generally avoid, but at the same time, so is completely dry air. There is a difficult balance to maintain, and MVHR units are no exception to trying to achieve the ideal balance.

In this blog, we will be answering the question ‘Do MVHR dry the air out?’

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 MVHR units 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 MVHR units. 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.

MVHR explained

MVHR is a term used in the HVAC industry, MVHR stands for ‘Mechanical Ventilation with Heat Recovery’. This is the technical term for what is generally known as heat recovery units, or heat recovery systems.

Heat recovery systems provide all the benefits of regular ventilation with the unique addition of being able to retain heat that would have been lost with regular ventilation. Heat recovery systems can come in single or multi-room applications.

Are there any advantages of MVHR?

Yes, there are many advantages of a MVHR system, the key advantage is its ability to retain warmth without contributing to humidity. This saves money that could be spent heating your home, whilst helping to prevent the environment that mould thrives in.

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. 

The advantages of heat recovery systems are the following:

  • Holds all the benefits of an extractor, including the removal of stale air, humidity and smells.
  • 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.
  • 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 reduced use of heating as a result of the heat conservation granted by a heat recovery unit can help you save on energy bills.

Should I get a single room MVHR or multi-room?

Multi-room MVHR units provide ventilation, and heat recovery to multiple rooms, which is ideal for larger, particularly older houses. Newer homes are build with insulation in mind, so although they can be used in newer homes, they are sometimes not entirely needed.

Single room systems are more suited for rooms that you know are a problem when it comes to ventilation, heat recovery and/or humidity. They can be installed in bedrooms, utility rooms, bathrooms, and kitchens. 

The one you choose is purely subjective to your needs and issues you are facing. If you require a second opinion, please don’t hesitate to contact us!

Do MVHR dry the air out?

No. MVHR does remove humidity from the air it extracts, but that does result in all the air in the home becoming moistureless. MVHR units are designed to remove excess humidity, rather than all the humidity, but why is this?

We as human beings actually require a level of moisture within the air that we breathe, if we don’t get this, there are effects that you can feel rather quickly. This includes…

  • Respiratory ailments such as asthma can be influenced by dry air.
  • Sore throats / inflammation can be directly attributed to air that is too dry and cold.
  • Irritation in the eyes as a result of the eye’s tear film being affected by the dry air.
  • Nosebleeds.
  • Dry skin.
  • Dehydration.

MVHR systems removes the excess humidity that can develop into condensation and eventually mould. They do this without compromising the optimal humidity that we need to breathe. 

Recognising dry or humid air in your home

There is a difficult balance to maintain when it comes to dry and humid air, but here is a very simple method for determining if the air in your home is too dry, or too humid.

The method is simply taking a deep breath through your mouth, whilst opening it as much as possible, although it seems silly, it has a valid reason. The wider your mouth is, the more air can enter, which will make it easier to know how humid or dry a room is.

Trying this method in a room with very dry air will result in you feeling a tickle down your throat, it may feel difficult to swallow, or your throat may feel dry after trying this method. In some instances, you end up coughing. 

When trying this method in a humid room, it will feel like you are inhaling warmth, there is little to no irritation either. 

In an ideal scenario, doing this method in a perfectly balanced room will result in nothing, it will feel like you’re breathing normally. Please note that trying this method when you are unwell will not yield the same results. 

Humidity tracking devices

There are devices such as a hygrometer which accurately monitors moisture levels in a room, bypassing the need for the breathing method. Alternatively, buying a dehumidifier, or humidifier, can help to increase or decrease humidity based on your needs. 

The dangers of mould

The chief aim of any ventilation system is to reduce humidity that can eventually become mould. This is because mould is not only an eyesore, but it also has the potential to spread, and harm those who have a sensitivity to it. 

Mould isn’t exclusively due to humidity, leaks that have not been addressed also contribute to this. Make sure to be vigilant before mould spreads.

Is a MVHR system worth it?

Absolutely, for anyone who struggles with maintaining ventilation, or the air quality in their home, MVHR systems take a lot of the hassle out of this job for you. It is especially ideal for those who are vulnerable or limited in their ability to move.

In addition to fresh outdoor air, the stale air from indoors is being recycled, whilst not losing any heat. In the long term, this can help you save money with your energy bills, as you are less likely to use your central heating if your home is already filled with fresh warm air.

Purchase a MVHR unit today

We at I-Sells endeavour to ensure our customers have all the information they require 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 answered the question ‘Do MVHR dry the air out?’

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

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