Direct Replacements


Direct Replacement HVAC units are a Seasons 4 specialty. We can custom-engineer an HVAC system for almost any need. Typically, we are called upon to find ways to upgrade old systems to provide better performance and efficiency while yet still meet the original footprint and match existing utilities.

High Rise office Buildings

Below is a time lapsed video of an old 230 ton Tempmaster air handling unit being replaced on a Saturday. The customer closed their high rise building on Friday afternoon and come back to a fully functional unit on Monday. Seasons 4, Inc. is one of the last if not THE LAST manufacturer of large format air handlers and package DX units. Time lapse video is courtesy of Noble Associates.


Below is another replacement of an older penthouse unit. This is a 290 ton Package air cooled DX unit that was replaced by Seasons 4. The new unit was shipped to the job site completely piped and charged with refrigerant, dramatically reducing installation time and costs.


Below is a Helicopter rigging of a direct replacement single zone unit. The units on this project were measured and a direct replacement built allowing the contractor and owner to quickly and easily install 42 new units on a mall in Michigan without interrupting their shopkeepers. Seasons 4, Inc. is a great choice for direct replacement HVAC units and even more so on “time is of the essence” replacements where the HVAC system cannot be down for very long, even when its being replaced.


General assembly of a Direct replacement multizone unit

Take a look at our 3D model and animated assembly video detailing components and assembly of a replacement Lennox DMS4 Series multizone unit.





Before  and After

Alton HVAC unit

Alton SZPackage Unit tired and ready to be replacedAfter

Seasons 4 Alton Direct replacement

Seasons 4 replacement ready to be placed into service




Seasons 4 has years of experience replacing existing Octagon Air Systems, Nesbitt, Carrier™, Trane™, and Lennox™ multizone units just to name a few.

The advantages of Seasons•4 replacement units include:

  • The installing contractors replacement liability is minimized
  • The old unit is completely measured by a Seasons•4 engineer
  • Seasons•4 guarantees the unit to fit the curb and the duct connections
  • The unit will arrive on-site at the time you choose
  • The pre-charged and tested unit is ready for immediate installation and operation
  • A Seasons•4 technician will be on-site to assist in the rigging procedure
  • The installation for one unit should not exceed 8 hours
  • The unit can interface with most control systems

 Direct Replacements