Humidifier????

[safwan]

What is the use of humidifier in AHU,even though we use coil for heating/cooling?

[tipsrfine]

The humidifier should only run when in heating mode. It is used to add moisture to the air. A lot of homes have too much air leaking from their home, so in winter, a lot of the cold dry air is pulled into the home. This can create very dry air.

[84randomdude]

The point of a humidifier is to add humidity to a home. So if your air is dry, you use a humidifier to put moisture into it. Especially in winter when your HVAC system is in heating mode. and very RARELY in cooling mode if you want more moist air in your home but it usually gets too humid/moist in summer. So humdifiers add moisture to the air mainly when you need more humidity.

[safwan]

Thankx.......Guys.

[NCHeat]

A humidifier is ONLY used in heating mode. The function of your AC is to remove the miosture from the air ( this making it cooler. moist air=warm air dry air=cooler air)
Ac is removing miosture.Why would you want to put it back??

[84randomdude]

A humidifier is ONLY used in heating mode. The function of your AC is to remove the miosture from the air ( this making it cooler. moist air=warm air dry air=cooler air)
Ac is removing miosture.Why would you want to put it back??

My grandparents, as well as a few other older people I know, breathe better when the humidity is about 50%. Not below 45% and not above 60%. So when the A/C removes too much, they use a humidifier to put a little back.

[big sky hvac]

A humidifier is ONLY used in heating mode. The function of your AC is to remove the miosture from the air ( this making it cooler. moist air=warm air dry air=cooler air)
Ac is removing miosture.Why would you want to put it back??

I had a customer that ran their humidifier in the summer because he said it helped his wife's sinuses? I tried to explain the purpose of a humidifier and what it does along with the purpose of A/C and what it does. He didn't care and I wasn't going to argue with him, but I agree that they really only need to run in the winter. Why do you want to add more moisture to your home by running the humidifier while running your A/C which is trying to remove the humidity? Chances are, the humidity in a lot of homes is high enough that the humidistat will not call for humidity unless the really crank it up.

[Ed Janowiak]

Spend some time in an arid climate with design grains in the negative double digits and see if your answers that humidifiers are only for use while heating changes.

Many areas in the US and abroad run some if not all of their cooling season without the AC ever removing any moisture.

It's easy to think locally, but you could be answering to someone who have a very different climate.

Kind of hard to get a lot of moisture out of them with no large temp diff (rise), but I could see a legit need for someone.

[big sky hvac]

Spend some time in an arid climate with design grains in the negative double digits and see if your answers that humidifiers are only for use while heating changes.

Many areas in the US and abroad run some if not all of their cooling season without the AC ever removing any moisture.

It's easy to think locally, but you could be answering to someone who have a very different climate.

Kind of hard to get a lot of moisture out of them with no large temp diff (rise), but I could see a legit need for someone.

Wouldn't most people that are in an "arid" climate prefer evaporative cooling over mechanical cooling then?

[Ed Janowiak]

Wouldn't most people that are in an "arid" climate prefer evaporative cooling over mechanical cooling then?

Yup, but many arid climates have water restrictions on them that do not allow the use of swamp cooler, so they are stuck with DX cooling or none.

[genduct]

Nice observation about thinking out of the box and climate Zone, and a very intelligent response to the swamp cooler question,
Ed, are you sure you are really from New Jersey?

Mike from Philly

[NBeener]

Yup, but many arid climates have water restrictions on them that do not allow the use of swamp cooler, so they are stuck with DX cooling or none.

Same with the CC&R's (Covenants, Conditions, and Restrictions) of the HOA (Homeowners' Association), where I live.

No comment :(