HVAC humidity control problems

Isn’t air-con speculated to take away humidity? So why is yours not doing the job?

Controlling humidity indoors is now extra vital than ever because of COVID, as a result of the virus thrives in each very excessive and really low humidity circumstances. It’s simply another reason (past consolation) to maintain humidity between about 40 and 60 p.c for many areas.

If you happen to’re sweating your manner by means of one other muggy August, learn on to study extra about HVAC humidity management and why your AC won’t be as much as the duty.

Then we’ll let you know 4 methods you may get an older unit to take away extra moisture so your house doesn’t really feel like a tropical jungle.

HVAC humidity management downside #1: Your AC unit is just too massive for the house

Initially, once we discuss AC dimension, it’s about cooling capability, not the bodily dimension of the unit. That’s not the one half that individuals misunderstand about AC dimension.

If you happen to’re not an HVAC professional, it might appear counter-intuitive to say that your air conditioner is just too huge to do the job successfully. Wouldn’t a much bigger system be capable to present higher HVAC humidity management in addition to cooling?

Sadly, the reply is not any. The very fact is, an outsized AC system does a poor job of controlling each temperature and humidity. That’s as a result of the highly effective compressor activates and off incessantly, so the system by no means runs lengthy sufficient to take away humidity from the air.

Your AC dimension must be fastidiously calculated utilizing a load calculation course of. In case your AC was chosen and put in by a builder reasonably than a professional HVAC firm, there’s a great likelihood that it was executed incorrectly. That’s what number of houses and companies find yourself with outsized items that present poor HVAC humidity management.

You may very well want to put in a smaller capability AC system to repair this downside.

Associated article: New York HVAC Systems: 8 Reasons Bigger is Not Always Better

HVAC humidity management downside #2: Your AC is restricted to a single velocity

An air conditioner that’s solely able to working at one velocity— principally, on or off—can have the identical issues as one which’s too massive with regards to HVAC humidity management.

When the unit can solely run at one velocity, it activates and runs full blast till the air reaches set temperature. Then it turns off till the temperature as soon as once more goes above the thermostat threshold. That usually means the unit doesn’t run constantly sufficient to take away humidity.

That’s very true at occasions when the temperature isn’t too excessive, however the air could be very humid.

When it’s time for a brand new AC system, take into consideration investing in a modulating HVAC system corresponding to a VRF system. A VRF system can run longer at a decrease capability, so it does a a lot better job of HVAC humidity management (and offering extra constant temperatures). One other plus: you’ll discover decrease vitality payments as nicely.

Associated article: 7 Reasons to Choose VRF Technology for Your New Air Conditioning

HVAC humidity management downside #3: Detrimental air stress in your house

Detrimental air stress is the results of a poorly designed air flow system. In a nutshell, it means that you’re venting an excessive amount of air from the house.

That may occur, for instance, in a restaurant with a strong kitchen exhaust system.

When you’ve gotten unfavorable stress, the air tries to steadiness itself by drawing in additional outdoors air any manner that it will possibly. For instance, every time somebody opens an outdoor door, a gust of wind appears to enter the room. Outdoors air can also be drawn in by means of each little opening within the constructing.

So what occurs when the relative humidity outdoors will get into the 70’s, 80’s and above?

You guessed it, all that muggy air is being drawn into the constructing. If the issue is unhealthy sufficient, your AC might not be capable to sustain, and HVAC humidity management is compromised.

Modifications to your air flow system design could also be wanted to right this problem.

HVAC humidity management downside #4: You’re utilizing the fallacious thermostat setting

It’s possible you’ll suppose you’re eliminating extra humidity through the use of your thermostat’s FAN ON setting. If you use this setting, the fan runs constantly even when the AC will not be working.

The fan does transfer air even with out the AC working, so that you would possibly really feel such as you’re getting some cooling profit. However you’re making the humidity circumstances worse. You possibly can find yourself blowing the moisture your AC has eliminated again into the house earlier than it has an opportunity to empty away.

HVAC humidity management downside #5: Your older unit merely can’t deal with the load

As your air conditioner ages, elements put on and it might not run as effectively because it used to. That tendency is elevated when the system hasn’t been frequently maintained. Along with inconsistent temperatures and insufficient cooling, you’ll begin to discover poor HVAC humidity management.

At this level, you might be dealing with a restore or change determination. Can some system tweaks be sufficient to revive ample efficiency, or is it time to chunk the bullet and put money into a brand new one? Right here’s a useful resource that may assist you resolve: Repair or Replace? A guide to making an informed choice when your HVAC system is down.

Repair-vs-Replace CTA

If you happen to’re not fairly prepared to exchange your air conditioner but, you may attempt these measures to spice up your system’s skill to struggle that indoor mugginess.

4 methods for enhancing HVAC humidity management in an present system

1. Clear the coils
That is the best factor to attempt first for getting higher HVAC humidity management out of your older system. Humid air outside is tough in your AC’s condenser coils, and so they can get dirty in a rush. That layer of filth and particles hurts the unit’s skill to launch warmth. Because of this, the AC doesn’t function as effectively and will have extra bother eradicating humidity from the air inside.

2. Get a preventative upkeep plan
Cleansing solely the coils might not be sufficient to revive efficiency and higher HVAC humidity management if the remainder of the system hasn’t been correctly maintained.

If you put money into a preventative upkeep plan to your air conditioner, you get an everyday inspection, tune-up and cleansing of system elements. Doing so retains it working as effectively as attainable to offer higher HVAC humidity management.

Your tech may even be capable to spot and repair impending issues earlier than they worsen and trigger the system to fail fully.

Associated article: 8 Ways AC Preventative Maintenance Keeps the Repairman Away

3. Alter the airflow
It’s generally attainable for a professional HVAC technician to regulate your system’s air circulation in a manner that makes the evaporator coil colder when humidity ranges enhance. That can lead to extra moisture removing and higher HVAC humidity management.

That is attainable just for sure forms of AC techniques, and it does carry some threat of ending up with a frozen evaporator coil. Speak to your AC skilled to see if this would possibly give you the results you want.

4. Add a dehumidifier to your system
If all else fails, and also you’re not prepared for an entire new air conditioner, you may add a dehumidifier to your air-con system for higher HVAC humidity management.

A dehumidifier removes extra moisture from the air earlier than it travels by means of your ductwork and into your house. Ask a educated HVAC skilled to advocate a dehumidifier that’s appropriate along with your air-con system.