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HVAC Options For A Home Addition

February 28, 2024

When adding a new space to your home, you will need to consider how you will heat and cool that new space. When it comes to HVAC solutions for a home addition, there are several options to consider. In this blog post, we will explore three popular choices: extending the current HVAC system, adding separate ductless mini splits, and installing a new HVAC system specifically for the added space.



Extend the current HVAC system


If your current HVAC system allows for it, you can just extend it to accommodate the new space. Extending the existing HVAC system to cover the new addition is a common choice for homeowners looking to maintain consistency throughout the entire house. This option involves connecting the new space to the ductwork of the current system and installing additional vents as needed. However, if your current HVAC system is not fit to heat or cool additional space, it is not a good idea to go with extending your existing system. It will create warm and cold spots in your house and could also lead to your HVAC unit breaking or requiring frequent repairs.



  • Uses the existing HVAC infrastructure, which can be cost-effective
  • Maintains consistent heating and cooling throughout the entire home
  • No need for additional equipment or space requirements


  • May require modifications to your current HVAC system, which can lead to increased installation costs
  • Limited control over temperature settings in the addition compared to the other options
  • Your existing system may struggle to adequately heat or cool the additional space, especially if it is a larger space


Adding separate ductless mini-split for the home addition

Another option for you is adding separate ductless mini splits for the new space. This is especially ideal when the addition is a larger living space or one occasionally used. A separate mini-split system allows the homeowner to control the heating/cooler for that space independently from the rest of the home’s HVAC system. Ductless mini-split systems offer a versatile and energy-efficient solution for heating and cooling individual rooms without the need for ductwork. Ductless mini-split systems can heat and cool your space which means that it can be used all year long. 



  • No ductwork required, making installation easier
  • Provides precise temperature control in the new addition without affecting the rest of the house
  • Energy efficient operation can lead to lower utility bills compared to traditional systems


  • Has a higher upfront cost compared to extending the existing HVAC system
  • Requires wall-mounted indoor units which could be unappealing aesthetically
  • Maintenance and repairs can be more complex and more specialized than traditional systems


New Dedicated HVAC system For the space 

Bigger additions and spaces may require a full HVAC system. This would be a good option for someone with a mother-in-law suite and needs to run HVAC in that space separately. Another reason you may need to have a new dedicated HVAC system is that your existing system is outdated or cannot adequately heat and cool the house with the new addition. This option allows for customized sizing and specifications tailored to the needs of the new space


  • Ensures optimal cooling and heating for the new addition
  • Very customizable and able to be tailored to specific needs of the new addition
  • Can incorporate the latest energy-efficient technologies for long term saving on utility bills


  • Higher upfront costs compared to extending the current system, especially if additional ductwork is needed
  • It requires dedicated space for the new HVAC equipment
  • Installation may involve more extensive construction work, which could lead to longer project timelines


What Option Is Right For You?

When it comes to HVAC options for a home addition, there is no one-size-fits-all solution. Each option has its own set of pros and cons, and the best choice will depend on factors such as budget, existing infrastructure, and the specific needs of the new space. Consulting with an HVAC professional can help homeowners assess their options and make an informed decision that ensures optimal comfort and efficiency. If you're a Maryland resident looking to update the HVAC system in your new addition, make sure to give us a call to discuss the best solution.