Chris Morin's Blog (47)

HVAC: A Fast Growing Career Opportunity

 After a recent successful post on LinkedIn, where I was promoting the hiring of apprentices from our Vocational Schools, I decided to do a bit of research that should not be too surprising to those of us within the HVAC and Plumbing industries.  If you are in fact looking to make a career change or commitment this year - please read below and consider a fast growing, high reward job in the…

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Added by Chris Morin on January 1, 2018 at 6:29pm — 1 Comment

HVAC Industry: Who wins with High Warranties?

During the sales process, it is inevitable warranty periods will be raised.  I remember raving about how the latest and greatest HVAC product led the industry with the longest warranty period.  Very often this only lasted a short period of time as other Manufacturer’s would continue to match warranties with their line.  Things often got out of hand as warranties have reached ‘limited lifetime’ on parts like compressors or heat…

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Added by Chris Morin on August 3, 2015 at 1:26pm — 4 Comments

The #1 Item Missing from High-Efficient HVAC Installations

     Imagine this: you go out to your local entertainment big-box store and purchase the top of the line “HUMONGOUS” television.  When you get home, you don’t think anything about it and just go ahead plugging it directly into the wall socket, right?  What’s that you say, ludicrous?  Of course, we would only plug that piece of beautiful technology into a UL rated surge protector!

     So, I gave it away in the first paragraph: a UL rated surge protector.  But, don’t…

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Added by Chris Morin on February 12, 2015 at 3:00pm — 5 Comments

How Low Should I Operate my Heat Pump?

UPDATED: Break Even COP’s for MA

How do you know if you should install a ductless mini-split, or upgrade your air-conditioner to a heat-pump and create a dual-source application during replacement this Winter?  I have been asked this countless times over the past week!  I personally always prefer the option of multiple fuel sources, particularly since energy prices have been all over the place during the last decade.  Fortunately, using averaged…

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Added by Chris Morin on January 14, 2015 at 2:30pm — 3 Comments

Should this Duct Layout be Banned?

When is it ok to put your ducts into an attic, tight up against the Roof Deck?  With more conventional building techniques, I would have to argue: NEVER!  I do not care how the homeonwer pleads to keep their storage space, you cannot count on delivering cool air to the conditioned space with said branch duct.  Even if you did figure out a way to secure the duct to the peak without crushing the inside diameter, the CFM is not the problem.  The real issue becomes the dry bulb temperature of…

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Added by Chris Morin on September 3, 2014 at 9:24pm — 3 Comments

Top 5 Changes to ACCA Manual S

      As I had brought up years ago, ACCA's Manual S was in dire need of an update.  Written in 1995, Manual S Residential Equipment Selection was passed by with huge technical and efficiency strides within the…

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Added by Chris Morin on August 27, 2014 at 8:30pm — 1 Comment

UPDATED: Big Changes for Duct Testing in MA

   If you have not been asked to complete a duct test by your local Massachusetts Inspector, it is just a matter of time before you are surprised by this stringent/updated code requirement.  Despite some push-back from Contractors  and Inspectors, all of MA is required to test new or altered duct systems.  All of MA adopted the 2012 International Energy…

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Added by Chris Morin on August 17, 2014 at 7:59pm — 9 Comments

No Bubbles, No Troubles!

Or is there? This saying is an old adage in our industry to let the technician know that the refirgerant charge is "all set". You see, there must be a steady stream of liquid to the metering device for it to function properly. For sake of conversation, let's use the TXV. In order for most TXV's to throttle and correctly maintain the desired Superheat, there must be a minimum of 2F of subcooled liquid at the valve (not where it is measured, near the condenser). If the liquid were to flash off… Continue

Added by Chris Morin on August 12, 2014 at 4:19pm — No Comments

How do You Test a TXV?

  Thermostatic Expansion Valves (TEV or TXV), one of the most popular metering devices for residential, high-efficient air conditioning and heat pumps, have performed almost impeccably for decades.  Unfortunately, some manufacturers in the past few years have identified batches of valves that have had high superheat issues.  Have we just been blind for so long, not realizing these problems existed?  Or have these valves really been so reliable for such a long time?

  If you think you…

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Added by Chris Morin on July 21, 2014 at 9:30pm — 3 Comments

Please, Make the Transition!

  For as long as I can remember, the agreed epidemic with ductwork was always undersized return ducts.  Although we are far from perfect with duct sizing in New England, I have frequently seen great strides in fixing this issue - particularly with replacement systems.  Lets face it, you should just be properly designing the duct system on new installations.  Undersized ducts cause great restrictions in airlfow, raising…

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Added by Chris Morin on July 17, 2014 at 8:29pm — No Comments

Top 5 A/C Code Requirements not Enforced

  This list does not represent the entire code, or even all municipalities.  Everyone knows those towns that will hit you on every piece of the local code requirements, word for word from the text.  But, don't be surprised when code officials, both building and mechanical inspectors, start failing permit inspections for these previously rarely enforced portions of the code!  Are you going to wait until enforcement, or lead the industry in doing what the minimum is required by…

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Added by Chris Morin on June 5, 2014 at 8:34pm — 8 Comments

DIY Minisplits: Which side are you on?

 Recently, Friedrich has modeled and sold in limited markets their DIY Mini-Split Heat Pump, Breeze.  Just a few days ago, they scaled back their rollout in order to meet customer demand by limiting sales to New York and South Florida.  I am torn between…

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Added by Chris Morin on May 17, 2014 at 9:51pm — 7 Comments

5 Things New Energy Efficiency HVAC Contractors Need to Know

1. Do not sell on Price! Use 'Simple Payback'

The price of High-efficient equipment will undoubtedly cost more money up front, compared to the minimum efficiency systems. Taking into account existing repair bills, utility bills, installation, and equipment costs, a high-efficient furnace, boiler, or heat pump will cost the homeowner less over the estimated 10-15 years of operation. When completing the 'Simple Payback' calculation, the high-efficient heating system in New England will… Continue

Added by Chris Morin on April 15, 2014 at 8:56pm — 1 Comment

Can you trust your Load Calc Software?

Attention Wrightsoft Users!

  Have you ever completed a load calculation and it just seems like it was short of what you had expected?  Particularly when you are first starting out with a tool, contractors can make mistakes. After all, we tend to learn "the hard way", right?  In an effort to make software work, the companies tend to start with some default values that require adjustment.  For instance, most have the duct system in…

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Added by Chris Morin on February 18, 2014 at 3:24pm — 7 Comments

Do you make this mistake on Maintenance?

     Cleaning the condenser coil.  This has always been the number one task that Service Technicians avoid at all costs when maintaining residential equipment.  Maybe it is the nature of the fast paced business when the weather gets hot?  Certainly could not be the lack of water to rinse the coil as there is almost always is a water spigot on either side of the home.  I cannot figure out why,  and this may be one of the largest aspects of seasonal maintenance that impacts the efficiency of…

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Added by Chris Morin on February 7, 2014 at 4:24pm — 1 Comment

4 Things a Quality Contractor Would Not Say

1. If you sign today, I will take $X thousand off!

This is a sales tactic often taken by a used car salesman. A Quality HVAC Contractor will price their installation with confidence, after finding a solution to fit the needs of the customer, and correctly sizing such equipment. I have no problem with "ballpark" numbers over the phone, as this can help sift through customers that are not interested in quality, so contractors do not waste time on what tends to be free…

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Added by Chris Morin on February 1, 2014 at 2:00pm — No Comments

The Basics: Superheat

Vital to the operation of the refrigeration cycle, superheat must be maintained and stable to protect the compressor.  We all know that the heart of the system cannot compress liquid (slug) without bad things happening.  This would represent low/no superheat.  But, did you know high superheat can cause valve and compressor problems as well?  No matter the reason for attaching your gauges to the system, you must check the superheat, in the air-conditioning cycle.…

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Added by Chris Morin on January 10, 2014 at 3:03pm — 3 Comments

"There can be no Economy where there is no Efficiency", Benjamin Disraeli

  For those who do not know, not that I would expect any of us should, Benjamin was a British Statesman and two-time…

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Added by Chris Morin on November 25, 2013 at 2:14pm — 3 Comments

Over-sized Equipment No More!

4 or 5 ton systems should be multi-stage...

Despite the passing of…

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Added by Chris Morin on November 19, 2013 at 10:36am — 4 Comments

Perception: The Service Technician

It was not too long ago that the HVAC Service Technician took great pride in representing the company he or she worked for. They would be at work early, enthusiastic for the day ahead; helping the elderly without heat first after the big snow storm. They would answer their emergency calls within minutes after the noise of the dreadful beeper, and later cell phone. It only took about five minutes, but shining their boots before heading out the door felt like an eternity. Removing them when… Continue

Added by Chris Morin on November 10, 2013 at 2:35pm — No Comments

Forum Discussions

Mini split installation location

Started by Jan Green in HVAC. Last reply by Franco Oyuela on Friday. 5 Replies

Think of the house as a really big duct

Started by Frank Spevak in HVAC. Last reply by John White on Friday. 2 Replies

Mini split air conditioners and ceiling fans

Started by Beverly Lerch in General Forum. Last reply by Beverly Lerch on Thursday. 13 Replies

Condensation on ceiling and walls of master bedroom

Started by Jerry Needham in General Forum. Last reply by John Nicholas on Thursday. 10 Replies

Latest Activity

John White replied to John Carton's discussion Insulation touches underside of roof in home with no soffit or soffit venting.
"Soffit vents can be used for intake, but they are not the only means of intake. If you have a…"
3 hours ago
Franco Oyuela commented on David Byrnes's video
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Why One Room Is Hotter Than Others

"If the temperature difference between your bedroom and your living room feels like walking from a…"
Friday
Franco Oyuela replied to Jan Green's discussion Mini split installation location
"First: Mini split are a great option. Second:vI agree with David that installing on the south…"
Friday
Pearl Home Certification's blog post was featured
Friday
John White replied to Frank Spevak's discussion Think of the house as a really big duct
"Thanks for sharing this helpful information. Want to read more on duct cleaning pros and cons.…"
Friday
Jan Green replied to Jan Green's discussion Mini split installation location
"Thank you, thank you!  I appreciate your insights.  I agree with the idea that installing…"
Thursday
David Butler replied to Jan Green's discussion Mini split installation location
"Hi Jan, in a room like that with a relatively balanced aspect ratio, flat ceiling and not much…"
Thursday
Rick Blair joined Kyle Brown's group
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Wrightsoft - Manual J / Manual D

If you use Wrightsoft to calculate loads or design ducts, you likely have questions.  Get answers…See More
Thursday
Jan Green replied to Jan Green's discussion Mini split installation location
"This is a very rough diagram of the detached casita.  There are currently no windows in this…"
Thursday
Sean Wiens liked Jerry Needham's discussion Condensation on ceiling and walls of master bedroom
Thursday
Andrea Simmonsen liked David Byrnes's video
Thursday
Beverly Lerch replied to Beverly Lerch's discussion Mini split air conditioners and ceiling fans
"Thanks.  A very reasonable, practical answer.  We have done our experimenting and ceiling…"
Thursday
Pearl Home Certification posted a blog post
Thursday
John Nicholas replied to Jerry Needham's discussion Condensation on ceiling and walls of master bedroom
"Jerry, ;Have you opened the cathedral ceiling?  "
Thursday
Blake Reid replied to Beverly Lerch's discussion Mini split air conditioners and ceiling fans
"Good opinions in these replies!  I'll just add a few: * Experiment.  It's your…"
Wednesday
John White replied to Jerry Needham's discussion Condensation on ceiling and walls of master bedroom
"Condensation on ceiling occurs when the attic space above is poorly ventilated or insulated. The…"
Wednesday
Joshua P Murphy is now a member of Home Energy Pros Forum
Tuesday
Franco Oyuela replied to Frank Spevak's discussion Think of the house as a really big duct
"THANKS for the information. Ducted mini splits offer hidden benefits."
Tuesday
Franco Oyuela replied to Wayne Melancon's discussion What's the Most Profitable HVAC Job for Your Company?
"Get into commercial, it's more money!"
Tuesday
David Byrnes's video was featured

Why One Room Is Hotter Than Others

Ever wonder if your air conditioner is working right because one room never gets a cool or warm as others? Do you need a bigger air conditioner to fix a room...
Tuesday

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