Tag Archives: plan

Breakthrough in Duct Sealing Prompts Questions and Planning

While reading my favorite AC heating forum this morning, I found a link to a Nov. 7 article on the U.S. Dept. of Energy (DOE) website. The article describes new duct sealing technology that could be a breakthrough in energy conservation – one that could save home and building owners in the U.S. up to $5 billion per year.  There is a link to the article at the end of this blog post.

Leaky ducts waste a lot of energy – estimates show that 25-40% of the cooled or warmed air (and the energy that produced it) gets wasted in transit. For the average homeowner, this translates to $50-70 per month in utility costs.

After the initial excitement of saving this much energy leveled off, I began to think of questions to ask, or situations where sealing an existing duct system might not automatically be a wise move, or could be done out of sequence.

Get the correct sequence for energy saving improvements
To be clear, making sure that ducts are sealed correctly is a top priority, and will save lots of energy. However, HVAC system improvements need to be performed in the correct sequence. So, before going to the effort and cost of having existing ducts sealed, here are some related issues an owner needs to find out or plan for:

Age of other main HVAC components
How old are the other outside and inside main components: compressor, condenser, heat exchanger and air handler? If those components are nearing the end of their economic life (generally around 10 years or older), they might need to be replaced first. Then, if main components get replaced, the existing ducts may need replacement with them — so that they are the correct size and other specifications. Here’s a critical point: one size does not fit all with HVAC systems and ductwork!

Were your existing components and ductwork correctly sized originally?
Even if the other main components will not be changed soon, is the existing ductwork the correct size for your current situation: existing components, your home or building envelope, your climate and other particulars? If equipment or ducts were not correctly sized or configured originally, sealing the ducts will not be a total solution. Ironically, the sealing of leaky, undersized ducts could trigger other previously obscured issues or complaints with your AC or heating system.  One example: if your AC or furnace was oversized, sealing ducts could cause your AC or heating system to cycle on and off too quickly.  Excessive on-off cycling involves unnecessary energy use, equipment wear, and comfort complaints.  So in this scenario, you pay twice: once to get your current ducts sealed, and then you pay again to fix the pre-existing problems in your system — problems that the duct sealing brought to light.

In summary, absolutely do get your ducts sealed, but get your ducks in a row before you sign on the dotted line. Choose the right contractor, and they will explain the optimum sequence of energy improvements for your situation.

Link to article
Read the full article on the duct sealing breakthrough on the U.S. Energy Department website.


Even the Best Air Conditioners Break Sometimes – And When They Do…

Most days of each month, I read an HVAC industry online news group. In those, I read that even the most established brands of AC and heating equipment sometimes have defects, recalls, service bulletins, and so on.  This is in spite of how well they are assembled at the factory or installed at your location.

Here’s our take on the situation:  when your system needs repair, which it likely will at some point, have yourself set to get it going again with minimal inconvenience, discomfort, and cost.  To prepare for the day when your system goes on the blink, below are a few practical questions to consider when you are deciding which local HVAC contractor to install it and brand or model of equipment to buy (in that order of importance).

– How long has the contractor been in business under the same name, location and ownership?

– What training, certification, and experience do their technicians have?

– What is the relationship of the contractor to the brand(s) of AC and heating equipment they sell: Owned by them?  Exclusive dealer?  Independent dealer?

– How many service trucks and technicians do they have?

– Does the local contractor have 24-7 service?

– Do they charge extra for service after hours, weekends or holidays?

– What is the parts and labor warranty from the manufacturer? From the installer?

– If you sign up for a yearly maintenance plan, do you get preferential appointment times, pricing, or both on repair work?

– Do they have a good rating with minimal unresolved issues at the Better Business Bureau – BBB?

– When you search online for their company name, are the online comments generally positive?

On this last point, online testimonials or rants, be aware of what we call the “wild west” effect. By that, we mean that, far too often, we see and hear about companies writing good stuff about themselves or even bad stuff about their competitors.  And some real customers who take the time to write are not always objective.

Not to worry. If you use most of the points above and ask your neighbors who they use, you’ll get a reliable composite of the companies you are considering.