Nerva Duct Seal helps convention hotel save thousands yearly

Capital Plaza finds Nerva Duct Seal reduces monthly energy bills, saving thousands each year in heating and maintenance costs, ending chronic mold problems and eliminates cold spots.


Nearly 90% reduction in leakage


Capital Plaza Hotel


Frankfort, Kentucky

Building Size

10-story; 160,000 sq. ft.

Opening Date


Building Type

Hotel / Convention


Reduct duct leaks; save energy; improve IAQ

Before Sealing

6,270 CFM system leakage

After Sealing

771 CFM system leakage

Pay Back

18 months

To say that the owners of the Capital Plaza Hotel in Kentucky were energy conservation skeptics would be an understatement. “If it worked, everyone would be doing it” was a familiar sentiment. Today, however, they are true believers. With the help of Nerva Duct Seal, the 10-story hotel and convention center, in the heart of the state’s capitol, has just been Energy Star certified. Owners estimate that duct sealing and other “low hanging” energy saving measures have reduced operating costs by $110,000 a year. Sealing leaks also fixed bathroom exhaust issues, eliminating chronic mold and mildew problems. Cold spots have been replaced with even temperatures throughout the facilities.

The work began with a “proof of concept” demo for the hotel where one section of the building’s entire ductwork system was sealed. The success of that demo led to the bigger project of sealing the hotel’s entire system.

During the demo we got to see how the Aeroseal technology actually worked. The computer-generated graph follows the sealing process in real time, and we watched as the leaks were sealed and the CFM of lost air went down to practically nothing. There was no other way, short of tearing down and rebuilding the hotel, that we could have gotten anything near these results.

Chad Braden, Director of Facilities, Capital Plaza

The sealing process took five days to complete. Payback is estimated in less than two years. Ongoing savings estimated for duct sealing alone is approximately $24,000/year. Additional savings are expected through reduced maintenance costs and equipment repair. The once skeptical owners are now enthusiastic supporters of Nerva Duct Seal and other energy conservation measures for significantly reducing overall operational costs.

I was getting quotes for an overhaul of the HVAC system that ran $1 million to $2 million dollars – it would have taken decades to pay back. We opted instead to seal the ductwork with Aeroseal. That dramatically improved the efficiency of the current system, allowed us to reduce energy use related to heating and the use of exhaust fans and it solved a lot of issues related to poor ventilation. We expect pay back on the duct sealing to take less than two years. Then it’s simply ongoing savings right off the top of the hotel’s monthly operating expenses.

Jason Delambre, Energy Consultant, Interdependent Energies LLC