Why a Timer Fan is More Recommended than a Fan with Humidistat Module

Why a Timer Fan is More Recommended than a Fan with Humidistat Module - picture of an Envirovent Fan with Humidistat operating in the bathroomWe have recently encountered this problem and there was a question from many of our customers: do I need a bathroom fan with humidistat function, or will a fan with timer do?

You could say that it all depends on what you need the fan for, what are the conditions the bathroom is in, what is the weather, what you use the bathroom for, etc.

But in general, for the majority of people, a bathroom fan with timer is more recommended than a fan with humidistat. Unless there are special conditions with extreme humidity being constantly in the bathroom, all you need is a timer fan. Let us explain why.

How does a Humidistat Fan Work?

What does this “humidistat module” do in a ventilation fan? Whether it is from Manrose, Vent-Axia, Envirovent, or Airflow, most of the bathroom fans come both in a basic version and in the version with timer, with humidistat, or even with timer and humidistat together (of course, the price is also higher).

A humidistat is a sensor within a certain module in the fan that detects the level of humidity in the air, and then switches ON or OFF the fan. The humidistat can be set and adjusted as needed, so that when there’s a lot of humidity in the air, the fan will automatically be ON until the humidity is eliminated.

How does a Timer Fan Work?

A timer bathroom fan is pretty straightforward and simple: you can set the time delay for the fan to continue to run once someone has used the bathroom and left (switching off the light).

In other words, the fan will continue running for a period of 30 seconds – 3-4minutes (according to your settings) after someone has taken a shower or has used the bathroom for more than 2-3 minutes.

This is the most common use of the bathroom fan, and most bathrooms are not completely and properly ventilated unless a ventilation fan with timer is installed.

Why are the Timer Fans Better?

Why are the Timer Fans Better? In the picture: an Airflow Quietair 100 with a humidistat sensor
Airflow Quietair 100 with a humidistat sensor incorporated

Again, we don’t prefer or replace a humidistat fan with a timer fan, but in general use people rather need a bathroom fan with timer than one with humidistat.

If your bathroom is in an area with a lot of humidity, it is good to get a humidity timer and set it on not-so-sensitive setting. If the humidity level in your bathroom is always up and ventilation is needed all the time, a fan with humidistat is a must.

But if you don’t have huge problems with the humidity and all you need is a fan that would ventilate the air and make sure you have fresh air while the humidity and odours are eliminated a regular timer fan is the best solution.

If you are planning to leave your house for a while and you know that the humidity can be up while away, you definitely need a bathroom fan with humidistat. But if you’re at home or your family is regularly using the bathroom during the day, you don’t need a humidstat fan but a fan with timer.

Tip: Don’t Fiddle Too Much with the Humidistat

A humidistat is a very sensitive module within the fan, and not everyone understands how it works. The mere fact that you see that the humidistat doesn’t turn the fan ON when you think that the humidity is high doesn’t mean that you need to regulate it and adjust it all the time.

Unless there are special humidity conditions in the bathroom, setting your humidistat on 60% or so should solve all the problems (see the manufacturer’s specs and ask your electrician about more precise advice).

But tinkering with the humidistat may cause it to be damaged – you simply have to “trust it”, that it will work whenever the level of humidity is higher!

Do You have a Similar Experience?

Did you install a humidistat fan? What is your experience with it? Maybe you want to share something you’ve learned while setting up, using, maintaining, and taking care of your humidstat fan (or timer fan) – please do so in the comments.

You can read more technical details on how the humidstat works here, here, and here. To purchase bathroom fans with timer, please visit the Ventilation Systems at Sparks Direct.