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This Is Part 1 Of A 2-Part Article

Lower Energy Bills In Large Homes With Supplemental, Ductless HVAC — Part 1 of 2

This article is about Supplemental Ductless HVAC for large homes — in addition to the Central HVAC.  You can dramatically reduce cooling & heating costs in large homes with a Supplemental Ductless HVAC System — and cool/heat only the spaces you use.   When the entire home needs to be cooled/heated — simply use the Central HVAC System (the Ductless System won’t run because the Central System is doing the cooling/heating).  There are no changes to the existing Central HVAC System — it operates as it always has.

Al’s Plumbing, Heating & A/C in Plano, Texas provides maintenance & repairs for all brands of Central A/C, Gas & Electric Furnace, and Heat Pumps.  Additionally, we sell and install new HVAC Systems from American Standard (same company as Trane), Ameristar (same company as American Standard) and Coleman HVAC (same company as York HVAC).

Al’s also provides full-service plumbing maintenance, repairs, and replacements for every plumbing component in your home.  Al’s sells and installs Rheem Professional Series gas & electric water heaters, and tankless water heaters.  Al’s is near your home in Plano, TX; Allen, TX; and Frisco, TX.  We service all homes in southern Collin County, Texas, and Denton County, Texas with no additional travel charge.

Call Al’s today to discuss any concerns or problems you have with your HVAC System or Plumbing.  We will arrange an appointment at your convenience and offer 24/7 Emergency Service.

photo of very large home

Image Source: ShutterStock

 

The Benefit Of A Ductless HVAC System — Is Being Able To Cool/Heat Only The Rooms You Choose

Large homes typically have multiple Central HVAC Systemswith each HVAC System cooling/heating 2,000 — 3,000 square feet.   It’s common for 1 or more HVAC Systems to serve the daytime living spaces AND 1 or more HVAC Systems to serve the bedrooms.  This allows the homeowner to set the thermostat to a more energy-efficient temperature in unused spaces.

In large homes — often only a few rooms are used daily.   Adding a separate, ductless HVAC System allows you to choose only the spaces you want to heat/cool.   A ductless system heating/cooling only those rooms reduces cooling/heating bills dramatically.  Whenever the entire home needs to be cooled/heated — the Central HVAC Systems will do that.

home with multiple HVAC Systems

Shown: This Very Large Home Has 6 Central HVAC Systems

Image Source: ShutterStock

A Standard, Whole-House HVAC System Isn’t Designed Or Installed

To Be Used As A Zoned System.

While it seems a simple solution to close air vents in unused rooms — closing vents in a typical, whole-house HVAC System throws its air-flow out of balance.  This can result in the HVAC System “Short Cycling” — the furnace running for short periods of time & shutting off.   This occurs because the System’s capacity was designed to serve the entire house.  With closed vents — the System’s capacity essentially becomes too large for the reduced area it’s serving.  This causes the System to Short-Cycle.

Having several ducts closed can result in an overheated furnace or frozen A/C indoor cooling coil.  Both of these problems occur because too little air moves through the furnace (due to closed ducts).  Short-cycling, overheated furnace, & frozen A/C coil all create tremendous strain on the HVAC System — and wear it out sooner.  NOTE: An overheated furnace shuts down until it cools off — then it restarts.

Click Here To See A Frozen Central A/C Cooling Coil (inside the furnace or ductwork — and can’t be seen without removing a panel): Frozen Central A/C Cooling Coil

A gas furnace’s (heat exchanger) allows heat (from the burners) to flow inside it — while the home’s indoor air flows along its outside.  Each time the furnace heats, the heat-exchanger’s metal expands.  When the heating-cycle ends — the metal contracts.

Over the years, this causes stress-cracks to form in the heat-exchanger.  A crack in the heat exchanger can allow carbon monoxide (from the burners) to enter the home’s indoor air.   Once the heat exchanger cracks — the entire furnace is typically replaced.  The cost to replace the heat-exchanger in an older furnace is seldom justified — because the repair cost is close to the replacement cost of the furnace.

Short Cycling Wears The Heat-Exchanger Out Faster — and the furnace must be replaced sooner than if it had been used as designed & installed.  In the end, the money saved by closing off rooms is lost — due to shorter furnace & A/C  life.

Click To See Where The Heat Exchanger Is Located Inside The Furnace (different furnaces have different locations): Location Of Heat-Exchanger Inside Furnace

Click To See A Diagram Showing How A Gas Furnace’s Heat-Exchanger Works: How A Heat-Exchanger Works

Click To See A Furnace Cracked Heat-Exchanger:  Cracked Furnace Heat Exchanger

 

Two Great Ways To Reduce Cooling/Heating Bills In A Large Home 

1. Add A Supplemental, Ductless HVAC System To Serve Only The Rooms You Use

Your Existing Central HVAC System Stays In Place And Remains Unchanged.

EXAMPLE:  If a large home has 5-6 bedrooms — and you’re using only 1.   You can add a ductless HVAC System to serve only the owner’s suite bedroom — and cool 1 bedroom instead of 5-6.

 – OR –

2. If You Are Having Your Existing Central HVAC System Replaced — You can upgrade to a Zoned – Central HVAC System.

The American Standard AccuLink™ Zoning System

The American Standard AccuLink™ Zoning System has electrically-operated dampers on many (or all) the ducts.   This allows the thermostat in each room to open or close the room’s damper as needed.  Combined with a Variable-Speed HVAC System — the outdoor unit & furnace blower-fan speeds up / slows down — based on the number of dampers that are open.  A variable-speed HVAC System adjusts itself to hundreds of different speeds — to align its output with the current heating or cooling needs of the home at any given time.   The System adjusts continuously as heating or cooling demand changes.

Click To See A Zoned-Central HVAC System Diagram: Zoned, Central HVAC System Diagram

Click To See A Zoned-Central HVAC System’s Ability To Provide Individual Room Temperatures: Zoned Central HVAC System with individual room temperature control

 

Copy The Link Below Into Your Internet Browser For A Brochure On The American Standard AccuLink™ Zoning System

https://www.americanstandardair.com/content/dam/americanstandarair/15-4156-03_HR.pdf

 

Supplemental, Ductless HVAC For Large Homes

Click For A YouTube Video Describing Ductless HVAC Systems.  Ductless HVAC Systems (At Time: 2:20 / 6:36)

ductless air conditioner indoor unit

Image Source: ShutterStock

Shown: Indoor Unit For A Ductless HVAC System.  There are many styles of indoor units.   

 

ductless air conditioner outdoor unit

Image Source: ShutterStock

Shown: Outdoor Unit For A Ductless HVAC System

Note: The outdoor unit can be placed on the ground or hung from the wall.

Click To See A Diagram Of A Ductless HVAC System Installation: Ductless HVAC System Installation Diagram

 

Click To See American Standard HVAC Ductless HVAC Systems Brochure: American Standard Ductless HVAC Systems

Note: American Standard Ductless HVAC Systems Are Made By Mitsubishi

Supplemental, Ductless HVAC Systems are also known as “Ductless Mini-Split”.  There is an indoor units connected to the outside unit by refrigerant lines.  The indoor unit has a cooling/heating coil & a fan.  It’s very quiet indoors — making the same amount of noise as rustling leaves.    The outdoor Heat Pump units for Ductless HVAC generate as little as 40-45 db of sound outside (Central system’s outdoor units start at 53db, with some up to 70db or higher).   In addition, all Heat Pumps make additional noise in winter during their defrost cycle.

American Standard’s / Mitsubishi Ductless Heat Pumps heat in outdoor temperatures as low as -13°F.  American Standard / Mitsubishi offers Ductless HVAC Systems are sized from 1,600 to 54,000 Btu.  NOTE: 60,000 BTU is a often called “5 Ton” HVAC System —  12,000 BTU’s = 1 Ton).

Click To Hear A Ductless Mitisubishi Ductless HVAC Indoor unit: Noise Level – Mitsubishi Ductless Indoor Unit

Click To Hear A Ductless Mitisubishi Ductless HVAC Outdoor unit: Noise Level – Mitsubishi Ductless HVAC Outdoor Unit

Hear 1 Of The Quietest Central HVAC Outdoor units: Noise Level Of 1 Of The Most Quietest Central A/C Outdoor Unit (from 10 feet)

 

 Cooling & Heating Several Rooms With One Supplemental, Ductless HVAC System 

Ductless HVAC Systems are ideal for large homes where only a limited number of rooms are used.  1 Ductless, outdoor unit can serve up to 4 rooms — and each room has with an indoor unit). One or more Ductless Systems can be installed.  For ductless systems with, up to 8 indoor units, there is a (stacked) two-compressor outdoor unit.

 

Copy The Link Below Into Your Broswer To Read More About American Standard HVAC’s Mitsubishi Ductless HVAC:

https://www.americanstandardair.com/products/heating-and-cooling/ductless/

 

Thermostat Options For Supplemental, Ductless HVAC Systems

Each indoor unit has a separate thermostat & comes with a Remote Control.   You can have each indoor unit set to the temperature you prefer.  The outdoor unit only runs when one or more of the indoor units are running.   If you install a larger Ductless System, with multiple indoor units (“zones”) — you can install a thermostat in each zone. 

If you want Smart Thermostats — you can install one for each Zone served by the Ductless HVAC System.  A Nest (brand) Thermostat is paired with an adapter that allows it to communicate with the other thermostats.  Also, a WIFI connection is required.

nest thermostat in heating mode

Shown: Nest Smart Thermostat

Image Source: ShutterStock

 

Click Here To Learn More About Nest Thermostat: AlsPlumbing.com Learn About The Nest Thermostat

 

 

There Are Other Options

If You Don’t Like The Look Of The Wall Units

ductless air conditioner indoor unit

Shown: Indoor Air-Handler Unit For A Ductless HVAC System

Image Source: ShutterStock

The aesthetics of a ductless system create issues for some homeowners.  In cooling-climates (like DFW) indoor units are typically mounted high on the wall, which may create an visual objection. If you don’t want the wall-mounted indoor unit(s) — other options are available.  Ceiling units mount within the ceiling, with only the grille visible.

Click Here To See A 24″ x 24″ Ductless HVAC System Ceiling Unit: Ductless HVAC System Ceiling Unit (installed)

This ceiling unit’s fan draws air into the center of the unit — and vents cooled or heated air along the outer edges. 

 

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This Is Part 1 Of A 2-Part Article

This article is about Supplemental, Ductless HVAC in addition to Central HVAC in large homes.  You can dramatically reduce cooling & heating costs in large homes with a Supplemental Ductless HVAC System.  This allows the homeowners to cool/heat only the spaces they use.   When the entire home needs to be cooled/heated — simply use the Central HVAC System (the Ductless System won’t run because the Central System is doing the cooling/heating).  There are no changes to the existing Central HVAC System — it operates as it always has.

Al’s Plumbing, Heating & A/C in Plano, Texas provides maintenance & repairs for all brands of Central A/C, Gas & Electric Furnace, and Heat Pumps.  Additionally, we sell and install new HVAC Systems from American Standard (same company as Trane), Ameristar (same company as American Standard) and Coleman HVAC (same company as York HVAC).

Al’s also provides full-service plumbing maintenance, repairs, and replacements for every plumbing component in your home.  Al’s sells and installs Rheem Professional Series gas & electric water heaters, and tankless water heaters.  Al’s is near your home in Plano, TX; Allen, TX; and Frisco, TX.  We service all homes in southern Collin County, Texas, and Denton County, Texas with no additional travel charge.

Call Al’s today to discuss any concerns or problems you have with your HVAC System or Plumbing.  We will arrange an appointment at your convenience and offer 24/7 Emergency Service.