Typically when you think of discussions about what makes one AC system better than another, the subject often gets turned into discussions about particular brands or manufacturer’s of said air conditioning equipment. This discussion winds up being anything productive as it is rarely about what is important to you and the comfort you will obtain for your home. Getting on the this brand is better than this brand band wagon is not going to help you any in my opinion. So then what is the best air conditioning system when it comes to addressing real issues in regards to your comfort not to mention indoor air quality? I like to call this: ‘The Devil Is In The Details’!
Note: This article is to describe what is better from a whole HVAC system approach with functions and benefits of this kind of HVAC equipment. These HVAC systems are not piece meal type systems. The whole HVAC system replacement approach has additional benefits other than what is discussed here. Never underestimate the importance of a great HVAC installation as well as a HVAC company known for repairing such systems, regardless of whether you are replacing one piece or the whole HVAC system all at once. There is no substitute for great service.
Humidity Control & Dehumidification
In a humid location like Katy, Texas it’s amazing that more HVAC systems in this area aren’t geared for controlling humidity better than what they do. The problem is that single speed air conditioning systems ‘over cool’ the air and cycle off too quickly in cooler weather to combat this problem properly. The AC system is controlled by temperature and nothing else and due to single speed operation of the system most of the time the unit cycles too soon to really control humidity in the home much at all.
Better humidity control will make you feel much more comfortable at higher temperatures than you would without it. What makes this problem so difficult to address is that humidity is independent from temperature. In a humid climate like Katy, Texas it can be humid even when temperatures dip below typical cooling temperatures. If it’s 75 degrees outside and 80% or higher humidity that is not very comfortable. With a 75 degree outside temperature your indoor single speed AC system isn’t going to run long enough to make you feel as comfortable as you could be in high humidity. The humidity levels in your home can easily be greater than 65% RH (relative humidity).
Did you know that RH readings of 60% or more inside your home can cause mold growth under the right conditions? Mold growth can contribute to an assortment of indoor air quality (IAQ) concerns. Humidity is something that is very important to your health as well as your comfort. You can test this yourself by buying a humidity meter for your home. Realize this reading will fluctuate just as much as temperature does during the various seasons of the year.
Whole Home Dehumidification Systems
This type of dehumidification system is a separate system that works with your current HVAC system. It has a separate control and it’s only job is to dehumidify the air in your home. This ultimately would be the best way to control humidity in your home. The problem with this option is cost. Part of this cost is the system itself, maintenance of that system and operational costs. It is estimated that running this type of system in a humid climate can add an additional 30% to your monthly electric bill. If you have two HVAC systems in your home that can get pretty costly of a consideration.
The real advantage to a whole home dehumidification system is that you could add it to your existing HVAC system without replacing any of that equipment. Over time operational costs and maintenance costs may become prohibitive for many home owners to consider this option.
HVAC Systems With Dehumidification Control
Humidity control with these systems is probably not the proper term to use. As I said earlier in this blog post, humidity in the home is a complex problem to solve because humidity is independent from temperature. So in many respects humidity control via your HVAC system is derived via an assortment of varying degrees of options or choices.
Some single speed AC systems can offer a degree of dehumidification control depending upon the furnace that the AC system is matched with. However, in my opinion it is very little difference than what you would have via just a single speed air conditioner and basic thermostat control. Part of the issue with this is ‘over cooling’ already mentioned. Because a single speed air conditioner delivers full capacity every time it turns on. During cooler and humid periods humidity control with this system would prove futile in most situations.
Multi Speed HVAC Systems
You see your air conditioner is really a dehumidification device. It is dehumidifying the air every time it runs. However, it is mostly controlled by temperature alone. Over capacity will cause the unit to cycle more and not run long enough to dehumidify the air. By installing a multi stage HVAC system or multi speed HVAC system you get better humidity control just by the way these particular HVAC systems run most of the time as opposed to a single speed AC system.
There are 2 speed air conditioners, 2 stage air conditioners, 5 speed air conditioners as well as variable speed air conditioners. The 2 speed and 2 stage AC variety more or less operate in first speed or first stage before enabling second speed or second stage. While running in speed 1 or stage 1 the system is running at a reduced cooling capacity which causes the system to run longer. This reduced cooling capacity could vary from 50% to 60 or 70% of the overall capacity of the HVAC system. Because the AC runs in this first stage most of the time it will run longer and dehumidify the air better than that of a single speed AC. The more speeds or stages the AC has the better it will control variations of the load of the home, the longer the system will run which in turn reduces and controls humidity better.
Dehumidification of these multi stage HVAC systems is included in normal operation of the unit when it cycles as well as a band of control via the thermostat controller of the system in question.
Indoor Air Quality & Air Filtration
Another benefit with these dehumidification enabled HVAC systems is that you get the best comfort for your home as well as better indoor air quality. You could add better filtration to one of these systems and attack the indoor air quality on both fronts… moisture content of the air as well as dust particle filtration. This is the best and proper way to address indoor air quality concerns.
If you suffer from allergies, asthma or other air quality problems I have the solution for you. Not all indoor air quality solutions are created equal. Over the years many IAQ systems have come to market that produce ozone. It has since been determined that ozone in any amount is not good for you and over time can actually make your symptoms worse.
Many times within the HVAC industry, solutions are often given by treating a symptom rather than addressing the real problem. I often refer to these as gimmicks bent on selling you something without really do much for you or putting the interest of selling you something just for the sake of selling you something ahead of what your true goals are. You would probably get more mileage out of chasing your own tail.
I go to the extent I go, to show you the right way to accomplish what you want to accomplish. Stay in the loop and subscribe to my You Tube Channel here. The solutions I offer are solutions that work. Why would you want anything other than that?
Thank you for visiting with me today. I hope I helped you understand things more clearly in regards to finding comfort options for your home. As always, I hope your day is comfortable.
About the author of this air conditioning blog:
My name is Ray Austin. I am the owner and operator of Austin Air Companie, a HVAC Service Company serving Katy, Texas | Cypress, Texas | Richmond, Texas and some surrounding areas. I am a Texas Licensed HVAC Contractor with over 20 years experience in Air Conditioning and Heating Systems. I hold an AOS degree in HVAC/R, EPA universally certified to handle any refrigerant and NATE certified in HVAC installations and repairs.
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