What Is An Air Handler?

Alright, listen up! You ever walk into a room and it just feels … right? The temperature, just right, the air cool, you can actually breathe? Yeah, you can thank the unsung hero of your comfort right there: What Is an Air Handler? It’s that MVP (the real MVP) of your HVAC system, and today, we’re going to take a deep dive so that you can actually understand what this bad boy does.

Vision your HVAC working together as a team. You already have the stars outside — your air conditioner or heat pump — hogging all the attention. But inside, grinding away quietly, ensuring that the conditioned air makes it to you is the air handler. It’s the workhorse, the distributor, the only reason your indoor climate isn’t a complete dumpster fire. So, let’s peek behind the curtain and try to understand what makes this machine run.

What is an Air Handler: It’s Not just a Fan in a Box

So, what is an air handler again? Simple; it’s the part of your air conditioning or heat pump system that is installed indoors and works to distribute the conditioned air – hot or cold – to the different rooms in your home. You might also refer to it as an air handling unit (AHU) or fan coil unit. You need not be scared of fancy names; it’s all the same workhorse.

Imagine it this way: Your AC or heat pump creates the cool or warm air, but the air handler is the delivery service, that makes sure that sweet relief (or sublime heat) actually gets spread to every corner of your living space through the ductwork. THE DAMPER This is the central distribution hub, ensuring that your thermostat’s wishes are answered in every corner of the building.

Looking into the Metal Box: Understanding a Fan Coil

These so-called air handlers are not just empty metal boxes; they’re full of birth-and-death components that have to work together like clockwork. Here’s who the key players are inside:

Blower Motor and Fan: This is the machine. The blower (also called a fan) powered by the blower motor, actually moves the heated or cooled air. It draws air through the return ducts, forces that air through the conditioning elements and then blows that conditioned air through the supply ducts. There are various kinds of these motors:

• Single-Speed Motors: These are your run-of-the-mill on/off dudes, full throttle when they’re on, off when they’re off. They turn on and off in a series of attempts to keep up with the temperature you have set. Consider them as a light switch: either all on or off.
• Multi-Speed Motors: A little more advanced, they can operate at several different speeds based on the heating or cooling that’s needed. It’s like a dimmer switch with, say, five settings.
• Variable-Speed Motors: This is where we start getting to the efficiency and comfort. And those motors can move at a wide range of speeds, to better tailor the airflow to precisely what’s required. They can operate at lower speeds over a longer span, which can translate to better temperature control, less energy consumption, and quieter operation. In fact Lennox has air handlers with variable-speed technology so you can experience constant social hovers and use less energy.

Evaporator Coil: The cooling element of your system. Refrigerant cools this coil when your AC or heat pump is in cooling mode. The coil soaks up the heat and humidity as the air from your home moves across it, and you are left with cooler, drier air.

Heating Coils or Electric Heat Strips: If your air handler is supplemented by or as part of a heat pump, you probably have heating coils that warm the air when the system switches to heating mode. In some configurations, particularly in more temperate climates or designed as a secondary system, an air handler may include electric heating coils to heat the air (Lennox’s EVENHEATER®). These heating strips can even preheat the air to avoid those nuisance cold drafts.

Air Filter: This is your number one defense against dust, allergens, and other scuz in the air. A clean filter not only gets rid of dust but also keeps the parts inside your HVAC system from getting gunky. Many air handlers are also compatible with filtration systems that can help increase your indoor air quality. Replace this sucker every so often and your lungs (and your system) will thank you.

Dampers: These are like small traffic cops in the air handler that determine which air goes where in the unit and also which air is directed to various zones of your building — if you have a zoning system. They let you tailor the temperature in various rooms.

Condensate Drain Pan and Drain Line: As air is cooled by the evaporator coil, moisture condenses and is created on the coil. This water is caught by the drain pan, and a drain line carries it away so water damage or mold can’t develop. And keep all this clear, or you have a swamp on your hands.

Enclosure: All of this goodness is contained within an insulated casing (frequently constructed from metal) to protect the various parts and prevent air leaks.

How the Magic Works: The Circulation and Conditioning of the Air

All right. So you know the characters. So, how do they all come together to help keep you comfortable? Here’s a day in the life of an air handler:

• Air Intake: In this blower fan, air is sucked from within your home via return ducts.
• Filtration: It is this air that flows through the air filter, catching all of those harmful particles.
• Conditioning: The filtered air passes through the evaporator coil to be cooled or the heating coils/heat strips to be heated, depending on your thermostat settings.
• Distribution: The blower then delivers the now conditioned air into the supply ducts and throughout the rooms of your home via the supply registers.
• Repeat: This cycle repeats for hours, hours and hours — constantly circulating and conditioning the air to keep your space at exactly the temperature you want.

Remember, the air handler doesn’t itself heat or cool. It’s simply the delivery system of the hard work your air conditioner, heat pump or furnace is doing.

Choosing Your Contender: Types of Air Handlers

Just as there are different kinds of athletes for different sports, there are different kinds of air handlers built for different purposes. These include such popular categories as:

• Residential vs. Commercial vs. Industrial: Residential units generally are smaller and built for homes, whereas commercial and industrial units are bigger and more durable to handle the larger buildings and more complex duct systems.
• Single-Speed vs. Multi-Speed vs. Variable-Speed: As we’ve mentioned, this is the type of blower motor and it is what determines how comfortable, energy efficient, and quiet you system will be. Variable-speed is generally the most premium option for keeping home comfortable while conserving energy.
• Constant Air Volume (CAV) vs. Variable Air Volume (VAV): CAV systems supply a constant air volume and adjust the temperature, suitable for single-zone uses. In multi-zone buildings, the VAV system is a more energy-efficient system because the volume of airflow can be modified at a constant temperature.
• Packaged Air Handlers:These include both the air handler and the condenser and evaporator in a single unit installed outdoors.
• Horizontal Flow Air Handlers: Ideal for tight spaces such as crawl spaces or attics where the airflow goes horizontally.

As you pick an air handler, remember to factor in your dwellings size, your existing HVAC system, and your budget as well as how much space and air flow you prefer.

HVAC The Great Debate: Air Handler or Furnace?

People mix these two up a lot, so I understand it. They both move air, right? Wrong! A furnace is a heating system that creates warmth by burning a fuel, such as natural gas, oil, or propane, or using electricity. It also has a blower that circulates that heat.

By contrast, an air handler doesn’t generate heat by itself. The heater will circulate the heated or cooled air provided by another system (usually a heat pump, or air conditioning unit with electric heat strips) without any additional usage.

Here’s the lowdown in a table:

So, if you’ve got a heat pump, you’ve almost certainly got an air handler inside. If you have a traditional furnace, it handles the air circulation itself.

Clearing the Air: Air Handler Versus Air Conditioner

Another common confusion! Air conditionerAn air conditioner is a apparatus for the removal of heat to the air. It often comes with an outside condenser unit and an indoor evaporator coil.

Airing handler is the indoor unit containing the coil and fan which air flows through after being conditioned by the air conditioner. The air handler hosts the AC system’s indoor evaporator coil in a majority of residences. So the AC cools and the air handler ensures that cool air circulates throughout your home. The air handler does a wider range than this, running the air when there is heat and, if equipped, doing the same when there is cold.

Your Air Handler’s in “Fighting Shape”: The Maintenance You Need

Like any machine, your air handler could use a little TLC to operate more smoothly and last longer. Here’s what you need to do:

• Change or clean your air filters often! This is the single most effective thing you can do. With fur-heavy households, shoot for at least annually, but more often if you have pets or allergies. Dirty filters are performance and efficiency killers.
• In the case of a gynecology-oncology patient, you’re different than your friends, family, or co-workers who should see a gynecologist once a year for a checkup. An HVAC tech will clean the coils, inspect for leaks, lubricate moving parts and make certain everything is in proper working order.
• Air Handler Maintenance Keep the area around the air handler clean and open. Good circulation is important and you want to make it easy for cleaning.
• Be aware of any abnormal sounds or vibrations. Rattling, squealing or banging can signal trouble that deserves attention.
• Routinely inspect the condensate drain line for blockages. Standing water can result in leaks and mold.

Troubleshooting: Popular Air Handler Problems

If you take care of your furnace, problems might still come up. Here are some telling signals to look for:

• Weak or no air flow: What’s your first thought? A dirty air filter. Not to mention omissions like blocked ductwork.
• Strange sounds: Rattles, squeaks, clunks? Could be nothing more than loose parts, a problem with the motor, or a defective fan.
• Water is pouring from around the air handler: The condensate drain is most likely clogged or damaged.
• Inadequate heating or cooling: Dirty filter, blower motor problems or issues with the coils are some possibilities.
• Air handler not coming on: First make sure the circuit breaker has not been tripped and for the thermostat.
• Anything off Check: Musty odors may be a mold issue (related to the condensate) or a burning smell (may involve electrical malfunctioning).

Some of these are the kind of things you might be able to handle yourself (like changing your filter) — but for anything complex or electricity-related, call in a professional HVAC technician. Safety first!

Long Haul: Duration of Life and Replacement

How long will its air handler last? Normally, that means a lifespan of 10 to 20 years, and with great maintenance you might stretch that to 30. Factors such as maintenance, climate and usage make a big difference.

How do you know when it’s time to replace it? Look out for:

• A lot of breakdowns and expensive repairs. If you are always on the repair guy’s speed-dial, it may be time to throw in the towel.
• Reduced energy efficiency and increased electricity and gas costs. An old unit is bound to be more expensive to operate.
• Continued unusual noises or vibrations that persistent post-mission. This is an indication that the internal components are about to deteriorate.
• Uneven heating or cooling in your home. If certain rooms always feel hotter or colder, your air handler could be to blame.
• If the unit is coming to or has exceeded its expected life cycle. And sometimes, it’s simply time for an upgrade.

Putting Down the Money: Costs and Installation Issues

When you have a new air handler installed, it’s often one of the most expensive upgrades since it’s part of your central air system so you need to do it right.

• System Matching is Key: The air handler must be matched to the heating or cooling capacity and efficiency (SEER rating for cooling) of the outdoor unit. What I mean by mismatched systems are inefficient systems that don’t work well together, they’re like a poorly built team, they don’t operate well and can cost you a lot of money. Mismatched systems could be at least 30% less efficient, according to the Air Conditioning, Heating and Refrigeration Institute (AHRI).
• Installation Costs Vary: The cost can depend on such things as the unit’s size and efficiency, the complexity of the installation, where you live and the brand. You may find yourself somewhere in the neighborhood of $7,000 to $9,900 for a full system installation. This doesn’t even include the unit, labor, and/or required duct or electrical work.

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The Bottom Line

So, there you have it. The air handler: It’s the equipment that everyone overlooks (and worse, here in Tampa Bay, most home builders hide this essential equipment in the hot garage), but it’s also the key piece that ensures whether the conditioned air produced by your HVAC system is keeping you comfortable. It’s not just a fan, it’s the nucleus of your indoor climate control. See to it and know its function, and you will be breathing more easily (in a real and a metaphorical sense) for years to come. What is an air handler? Now you know — it’s really the unsung hero of your comfort at home!

Frequently Asked Questions (FAQs)

What’s the difference between AC and air handler? The air conditioner is the machine that actually cools the air by removing the heat. It is a split system, with an outdoor condenser and an indoor evaporator coil. The air handler is the indoor unit that moves that conditioned air (and heated air, for heat pumps or when paired with heat strips) through your home’s ductwork. In most systems the air handler is the unit that contains the evaporator coil.

What does an air handler do? An air handler serves the primary purpose of circulating conditioned air (either cooled or heated) throughout a space. It is also apparent that its operating in an air-filtering mode, and may provide some humidity control.

Are there air handlers in every house? Not necessarily. Air handlers are usually located in homes with a central air conditioning system and forced air, and homes with predominantly heat pump heating. Houses with other heating and cooling systems — window air conditioners, baseboard heat, or radiant heat, for example — may not have a separate air handler. If you have a furnace, it tends to have its own blower to facilitate air circulation.