Frequently asked questions (FAQ) of PMC Energy Services, Inc

Scheduling An Assessment.

Scheduling The Job

Preparing For The Job

We will generally arrive at 8:00am on the scheduled day (but can accommodate other start times if you let us know in advance).  You’ll need to do a few things to prepare for our arrival, including:

  • Provide a place to park our 30-foot trailer that enables reasonable access to your furnace – we have equipment that weighs roughly 120 pounds that we’ll need to transport to your furnace location.
  • Clear an area around the furnace for us to locate our equipment – a 3-ft x 6-ft floor space within 5 to 10 feet of the furnace will generally suffice.
  • Ensure all registers are easily accessible. (We’ll bring a small step ladder for those mounted high on the wall or on the ceiling.)
  • Contain all pets. dog-on-register
  • Cover any sensitive electronics – while we take every precaution to minimize leakage of the sealing aerosol into your living spaces, some may occur.
  • Should the sealing aerosol leak into your living space, we may need to ventilate your home.  Be sure that all windows and doors are unlocked and can be easily opened.

We recommend that everyone (other than our technicians) vacate the house during the treatment.  While the sealants and aerosol are non-toxic, they can be a respiratory irritant, so we strongly urge that small children and anyone with respiratory issues not be in the house during sealing.

Completing The Work

  • WE STAND BEHIND OUR RECOMMENDATION. One of the first things that we do after arriving to do your job is connect our machine to your duct subsystem and pressurize it to measure initial leakage. If we’ve recommended sealing (during the assessment) and leakage is less than 20% of your furnace blower capacity, we’ll immediately review this with you and give you the option to abort the job at no further cost to you. You can rest assured that we’ll only recommend sealing if we believe that it will address your objective(s).
  • If we’re sealing both supply and return subsystems, the job typically takes up to 8 hours; if only the supplies, up to 5 hours.
  • Plugging the GrillWe’ll generally seal the supply subsystem first as it’s not uncommon for the return subsystem to utilize wall cavities which could bring supply subsystem leaks into play if they’re not already sealed. We’ll remove the register grilles and temporarily plug each with a sturdy foam pad. Meanwhile, we’ll cut an access hole in the supply plenum just downstream of the furnace (and a/c unit, if present) and isolate the furnace with a large foam pad and tape as necessary. We’ll connect the Aeroseal sealing machine to the access hole with 2-ft diameter flexible tubing. If initial leakage is exceptionally high, we will look for large holes including the possibility of disconnections or breaks in the duct work… and repair those first. After verifying that those repairs have reduced leakage to a reasonable level (which may still be on the order of 20-40% of system capacity), we will begin the Aeroseal sealing process; it typically takes 20 to 30 minutes to seal a supply system that’s in good condition.
  • During the sealing process, you may hear a hissing sound produced as the aerosol travels throughout the duct system. In the event that some aerosol may leak into the living spaces, we may employ one or more of our portable air filtration Setting up the Machinesystems to handle this and/or open windows and doors to encourage natural ventilation. Once we’re satisfied that the system is sealed and we’ve de-pressurized it, we’ll remove the foam pads in the registers and manually seal – caulk and/or expandable foam – the gaps between the wall opening and the duct boots.
  • The process to seal the return system is similar. The exception may be that, if the wall cavities are used to draw air from the rooms in the house to the furnace, the Aeroseal sealing process may take 60 minutes or more to complete.
  • Once both sides are sealed, we’ll replace the grilles and may take final temperature and air velocity measurements to compare to original conditions. In the meantime, we’re removing our equipment from the house, patching the access holes to the furnace, and cleaning up.
  • The sealants cure in about 2 hours. During this time, you may notice a slight odor similar to Elmer’s glue.
  • Finally, we’ll review the results of the service with you including Certificates of Completion for each Aeroseal sealing process (which will indicate the initial and final leakages for each system) and (if conducted) a before-and-after comparison of register temperatures and air flow rates, before reviewing the bill and requesting final payment.
  • Yard SignYou should notice an immediate improvement in comfort throughout the home, including more uniform temperatures from room to room and (if the return subsystem was sealed) you may notice a reduced levels of airborne dust and allergens. As you go through your next heating or cooling season… and for years to come, you should also notice a significant reduction in energy costs.


The price of your job will depend on accessibility to your furnace and plenums, the number and location of registers in the subsystem, and whether we’re sealing one or both subsystems. If we have to make exceptional repairs to your duct subsystem(s) before sealing, that will also affect the price.

For example, if your supply subsystem is comprised of 16 registers – half on the floor and half on the wall, the sealing price will typically be $1550 to $1850. If you additionally have your eight-register panned/wall-cavity return subsystem sealed, expect the total price to be $2850 to $3250. (If your return subsystem is fully ducted – most constructed before 2012 are not, sealing is much quicker and the total price could be $500 to $600 less.)

In addition to the substantial energy savings most homeowners enjoy after we Aeroseal their ducts, you may be eligible for financial incentives through the Home Performance with ENERGY STAR Program administered by NYSERDA. We will be happy to assist you in applying, including scheduling a comprehensive energy assessment (free for most New Yorkers) by one of our industry partners prior to our sealing application.

For qualified applicants, current incentives from NYSERDA include:

  • 10% rebate after the work is complete.
  • For income-eligible households, a grant to pay up to 50% of the cost. (Two- to four-unit building owners may also qualify).
  • Affordable low-interest loans or on-bill financing with Energy Finance Solutions .

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