Mini-split systems are an excellent heating and cooling solution for older homes, but their installation can come with unique challenges. Many homes in Cambridge, Arlington, and Winchester were built before modern HVAC systems existed, meaning they often lack ductwork, insulation, and sufficient electrical capacity.
Fortunately, these challenges can be overcome with expert planning and professional installation. If you live in an older home in the Boston Metro area and are considering a mini-split system, here’s what you need to know.
Need expert installation? Contact Lund Plumbing & Heating for professional mini-split installation in historic homes.
1. Structural Limitations in Older Homes
The Challenge:
Many older homes in Belmont, Lexington, and Newton have solid walls made of plaster, brick, or wood paneling, making it difficult to install the refrigerant lines needed for mini-splits.
The Solution:
- Careful placement of indoor units to minimize damage to walls.
- Using surface-mounted conduit when running refrigerant lines through historic homes.
- Ceiling-recessed or floor-mounted units for homes where wall-mounted mini-splits are impractical.
Related: Learn where to install mini-splits for maximum efficiency.
2. Insulation & Air Sealing Issues
The Challenge:
Older homes often have poor insulation and air leaks around windows, doors, and attics. Without proper insulation, even the most efficient mini-split system may struggle to maintain comfortable temperatures.
The Solution:
- Sealing air leaks around windows and doors.
- Upgrading attic and wall insulation for better efficiency.
- Choosing a cold-climate mini-split designed for homes with some insulation limitations.
Fact: Homes in Winchester and Medford built before 1950 often have little or no wall insulation, making proper air sealing essential before installing a mini-split.
Related: Learn how mini-splits perform in extreme cold.
3. Electrical System Limitations
The Challenge:
Many older homes in Arlington and Somerville still have outdated electrical panels with 100-amp service, which may not support the added load of a multi-zone mini-split system.
The Solution:
- Upgrading the electrical panel to 200-amp service if needed.
- Running dedicated circuits for mini-split units to avoid overloading existing circuits.
- Working with an HVAC contractor who coordinates with licensed electricians for a seamless installation.
Considering a system upgrade? Contact Lund Plumbing & Heating to assess your home’s electrical readiness for mini-splits.
4. Finding the Right Locations for Indoor & Outdoor Units
The Challenge:
Older homes often have limited wall space due to fireplaces, built-in shelving, and windows, making it difficult to install indoor air handlers. Outdoor space may also be tight, especially in densely built neighborhoods like Cambridge or Brookline.
The Solution:
- Using floor-mounted or ceiling-mounted mini-splits when wall space is limited.
- Placing outdoor condenser units on brackets or rooftops in tight spaces.
- Selecting a multi-zone system that requires fewer outdoor units.
Related: Learn how to choose the right mini-split for your home.
5. Preserving the Home’s Historic Aesthetics
The Challenge:
Many homeowners in historic districts like Newton and Lexington want modern climate control but don’t want bulky HVAC systems altering the home’s original look.
The Solution:
- Choosing low-profile wall units that blend with historic interiors.
- Using concealed refrigerant line covers to match existing trim.
- Installing discreet ceiling-mounted units in homes with high ceilings.
Tip: In Cambridge historic homes, mini-splits can be placed in attics or sunrooms to provide cooling without disrupting the home’s original design.
Related: Learn how mini-splits increase property value in historic homes.
Final Thoughts: Work With a Mini-Split Specialist for Older Homes
Installing a mini-split system in an older home requires careful planning to address structural, electrical, and aesthetic challenges. At Lund Plumbing & Heating, we specialize in:
- Customized mini-split solutions for historic homes.
- Strategic unit placement to maintain the home’s character.
- Coordinating electrical upgrades when necessary.
Call (781) 944-2222 or schedule a consultation to discuss mini-split installation in your older home.
