Do Window Ac Units Pull Air From Outside

Do window AC units pull air from exterior?

Nosotros don't usually wonder from where the cold air comes from. However, when you run across wildfires burning, and the sky being orange from all the fume, yous don't actually want all that dangerous smoke in your habitation.

Window AC filters (ordinarily MERV xiv rated filters) are certainly not adequate to stop the wildfire smoke if your unit pulls the air from outside.

If yous read some articles about 'does window air conditioner pull air from outside', you might go a partially wrong idea. That thought is that 'No, window AC units definitely don't pull air from exterior, they simply recirculate the indoor air'. That, however, is not entirely true.

how window air conditioners pull air from outside during wildfires season — Wildfire smoke tin be harmful and you definitely don't want your window AC pumping it directly inside your dwelling.

Certainly, most window air conditioners don't pull air from exterior. But not all.

In this EPA's recommendation, you might detect a inkling why that reply is partly incorrect:

"If your HVAC arrangement or window air conditioner has a fresh air pick (meaning information technology pulls in air from the outside), turn information technology off, close the intake, or set the system to recirculate mode." (EPA recommendation for indoor air quality during wildfire)

At present, let's go the tape directly:

Some window AC units don't pull air from outside. Some window AC units exercise pull air from exterior.

Luckily, there are non many window Air-conditioning units that pull air from outside. Only yous don't want to be that guy who thinks he or she has a standard no-air from the outside window Air-conditioning simply to be proven wrong when window Ac starts pulling in wildfire fume.

In well-nigh cases, window AC units that pull air from outside are ameliorate (higher free energy efficiency, no negative pressure level problem, no stale air). However, in limited cases, having a window-mounted air conditioner is not ideal. Some of these cases include:

Wildfire season.
Living in an expanse with low outdoor air index quality.
Window is higher up a busy street.

The central question is not if window air conditioners pull air from outside. Information technology's this i:

Does My Window Air Conditioner Pull Air From Outside?

If information technology doesn't, you're all good running information technology even during wildfire season. If it does, withal, you want to close information technology off completely or just shut off the fresh air option.

Here's how to tell if you have a window air conditioner that pulls air from outside the house:

Every fresh air window air conditioner will have a 'Fresh Air Mode' mode.
If information technology has 1, yous will notice it on your AC dashboard, remote control, or in the Wi-Fi connected app that sets the window Air conditioning settings.

If turned 'On', the fresh air vent located on the outer role of the unit (the part that sticks outside) volition be open up. When the fresh air option is turned 'On', this vent volition draw in outdoor air.

window ac with fresh air intake vents — Here are all the key parts of a bones window Air-conditioning unit. The fresh intake vent is located on the outdoors side of the unit of measurement.

This volition reduce the negative pressure window Air conditioning units can cause (because they are only expelling air and thereby reduce the total air quantity inside) simply it will pull the smoke-filled air in.

Do yous need to shut downwards a window air conditioner during a wildfire if you notice this option?

Not at all. If you do find this option and there is wildfire fume outdoors, you know what to do:

Just turn it 'Off'.

This will immediately close the fresh air vent, and you won't be pumping smoke-filled air indoors.

Note: Cardinal air conditioner can have the same 'Fresh Air Manner'. Be sure to turn information technology 'Off' during the wildfires season.

What To Practice If The Smoke Is Already Indoors?

Usually, when we have smoky air indoors, we just open the windows. In this case – when outdoor air is contaminated by wildfire smoke – you can't actually do that.

How to become rid of indoor smoke during wildfire flavour?

Recently, nosotros have published an article nearly how to fume indoors without it smelling. Under #5 tip you will find a solution that works well for wildfire season.

To get rid of the fume and ameliorate indoor air quality, just become an air purifier. Air purifiers have two filters that deal with whatever smoke, even wildfire smoke, very well. These are:

HEPA filter. This fine filter captures fume particles.
Activated carbon filters. This filter adsorbs gaseous smoke aroma.

Pretty much any air purifier with these filters will work. The ones that work the all-time are air purifiers with high fume CADR rating (a metric that tells yous how efficiently air purifier reduces the concentration of 0.9 and 1.0 μm sized smoke particles).

If y'all need some help with picking an effective air purifier, you might find our article about the best air purifiers for wildfires hither helpful.

Summary: Most Window Air conditioning Units Don't Pull Air From Exterior (But Some Practise)

Hither's the lesser line:

About window AC units don't have fresh air vents that would suck in air from exterior.

The primal is to bank check if your unit has one. You can practice that by checking if it has 'Fresh Air Mode' on the units' dashboard, remote command, or the controller smartphone app.

Even in that instance, you tin can but turn it 'Off' and avoid the wildfire smoke being pulled into your dwelling.