25 Years of Remodeling &
Renovation Experience


HVAC Ductwork

We Offer the following HVAC Ductwork Services: 

  • Duct Sealing and Duct Insulation - Residential Retrofit
  • Duct Repair and Duct Replacement
  • Duct Leakage Testing -- Residential Energy Code -- Required for New Construction and when HVAC is Altered or Replaced

While they are out of sight, the condition of your HVAC ducts should not be out of mind. Although you may not think about your ducts often, they can impact your energy consumption, safety, and quality of life.

Ducts that are properly designed, installed, and insulated are essential for optimal energy performance and comfort.  If your furnace is frequently turning on and off, if rooms are either too cold or too warm, your ducts may be poorly designed, disconnected, damaged, or inadequately insulated.

The benefits of repairing, replacing, sealing, and insulating your ductwork include:

  • Regulated room temperatures and enhanced comfort
  • Improved indoor air quality
  • Better efficiency and longevity of heating and cooling systems
  • Reduced energy bills and environmental impact
  • Improved building health & safety
  • and more!

Duct Sealing and Duct Insulation - Residential Retrofit

Air ducts are one of the most important systems in a structure; if they are poorly sealed or insulated they are likely contributing to higher energy bills. 

A duct system is a branching network of tubes in the walls, floors, and ceilings that carries air from the furnace and central air conditioner to each room. Ducts usually are made of thin sheet metal that do not retain heat very well and are susceptible to leakage at the joints.

Duct leakage can cause severe indoor air quality problems by drawing contaminated air into the home from the crawl space.  It also increases energy use by heating the crawl space instead of your home. The average duct system leaks 30% of conditioned air.

Sealing the leaky duct joints and insulating ducts in unconditioned spaces is usually very cost-effective way to make your structure more comfortable and energy efficient.

We specialize in duct sealing and duct insulation.  Our technicians are trained by Puget Sound Energy to air seal ducts under PSE’s prescriptive “Duct Ninga” program.  Our technicians are also Performance Comfort Tested Systems (PCTS) duct seal certified.  We use professional grade and performance tested duct sealants and duct insulation products and proven duct sealing and duct insulation methods that are guaranteed to lower utility bills and provide enhanced comfort. 

Learn more about duct sealing here: 

Duct Repair and Duct Replacement

In addition to making sure your ducts are properly sealed and insulated, Energy Efficiency First examines ducts to assure they are in proper working order.  We offer duct repair and replacement services to assure that conditioned air reaches all the rooms of your home or structure and to optimize your comfort. 

Heating and cooling costs is a major part of your utility bill. Replacing or repairing ducts can save you anywhere from 20% to 40% on home heating and cooling costs.

Duct Leakage Testing -- Residential Energy Code


The new Washington State Energy Code established new standards for the tightness of ducted HVAC systems. 

Systems in newly constructed homes must be tested for leakage to the outside.   Duct Testing Standard (RS-33) is used and must be based on the protocol for “Total Leakage Testing” or “Leakage Testing to Outdoors.” Duct leakage in new construction shall not exceed 0.04 CFM25 x floor area (in square feet) served by the system for leakage to outdoors or for total leakage when tested post construction. With certain exceptions, when testing at rough-in, targets should not exceed 0.04 CFM25 x floor area (in square feet) for total leakage or 0.03 CFM25 x floor area (in square feet) if the air handler is not installed.

When a space-conditioning systems are altered in existing construction by the installation or replacement of space conditioning equipment (including replacement of the air handler, outdoor condensing unit of a split system air conditioner or heat pump, cooling or heating coil, or the furnace heat exchanger), the duct system that is connected to the new or replacement space-conditioning equipment must be tested for leakage, preferably for leakage to the outside. Certain exceptions apply.  The test results shall be provided to the building official and the homeowner.

All testing must be done by a qualified technician. The minimum qualification requirement is documented attendance at a duct testing training course approved by the building official, such as Northwest ENERGY STAR Homes Program, Performance Testing training for new construction and Performance Tested Comfort Systems (PTCS) training for existing homes and new construction.

Duct systems must be designed, sized, and installed using recognized industry standards and International Residential Code (IRC) requirements, so that calculated heating and/or cooling loads are delivered to each zone.

Out staff have gone through both of the above trainings and are trained and equipped to perform the required testing to help new construction builders and HVAC companies comply with the Washington Energy Code’s testing requirements. 

If you are a residential builder or an HVAC company altering an existing HVAC system, call on us to perform required testing for you and help you coordinate with local governmental agencies.  We are pleased to offer package rates to builders with multiple properties. 


For more information about the benefits of improving your home's ductwork and HVAC system, or to schedule a home energy upgrade today, contact us here!