Danisi Energy Co Inc.

So far so bad. We had a new HVAC unit installed last summer.....and since then I think we have called for service at least 10x. I have spent more days uncomfortable with a non working AC system than days when it worked. They said it was my thermostat.....I got the one they suggested. Still the same problem. It does not cool the house. Then I am told I have to wait a couple of days for service??? I waited a couple of days last week. I am not happy.

I've waited a few months to write this in hopes that I would calm down or my feelings would soften a little. I don't think I've ever written a bad review about anyone.  In fact it is so much more fun to write a positive review than a negative review.  But I have used these forums as a way to find good help and I have found a great power washer, electrician and plumber so I figured I should do my part in providing a review, even if it is negative.  First, let me say that I am only one review and it's possible I could be a one off experience and that most people have a good experience.  And second, let me first list the thing that went well.  My AC is installed and it is working wonderfully.  It is quiet and cools the house very well.  The work that I hired Danisi to do was completed.  The process to get here was difficult, sloppy and unfriendly.  I'll put these in order - 
Difficult:  I think my main complaint was the lack of communication.  The entire process took about 3 months (my house is 1800 sq ft).  From ordering the parts until the installation was complete  And I'm not sure I care that it took 3 months except I never knew where were were in the process.  I told the sales guy (or my main contact) I really needed him to communicate with me so that I wouldn't just go to the house and find another week went by when it wasn't completed.  In addition to this there was a part of the installation process that requires an electrician to come in and connect everything.  One weekend I went out to the house and yet again, the AC wasn't installed.  I finally got a hold of the sales guy later the next week and he said he was waiting on me to call the electrician to hook up the units.  No one had communicated to me that I needed to contact someone to connect the two.  So a week (or maybe 2) went by because they were waiting on me to call an electrician but they failed to tell me that we were at that step.  If you are a more hands on project manager (I have a full time job that is demanding of my time so I need service people to communicate) then you may have been a little more aware of the process.  
Sloppy:  I am renovating my house so it's possible they cared very little about the mess.  When installing the AC in the attic they broke the attic door, got the walls super dirty and left holes in the ceiling.  After asking several times about the holes and the broken door they did offer to fix it.  I would think they would fix it before the job was done and I wouldn't have to ask them.  Anyway, I choose against it since I'm renovating.  They did however, offer to install the wifi thermostat in order to "pay for" the broken attic door and holes in the ceiling.   Which I of course took them up on.  Also, the holes for the vents are not cut evenly.  They are big enough for the vent to fit in but they are not perfect squares.  Lastly, the thermostats put on the walls are crooked.  
Unfriendly:  After trying very hard to communicate with them they were somewhat hostile.  Not once did they apologize or try to solve the problem.  They did, however, blame me for quite a bit.   They made me feel totally taken advantage of, which is a terrible feeling.  
I tend to think you can catch more flies with honey so I tried to be very nice but in the end I think a heavier hand will work better.  It's not my personality and I just refuse to stoop to a level that is mean or overly aggressive.  I spent a lot of time regretting my decision to go with Danisi and even a few tears.  It was partially my fault because I didn't get more than one quote.  I hope this review helps you.  And like I said, I could just be a one off.  But if they were friendlier or attempted to recognize the problems and try to fix them rather than blame them on me/other people, my experience would have been a lot better.  In my mind a little friendliness can cover up a lot of mistakes.  

The primary task of an HVAC contractor is to determine the correct size of the systems components: A/C tons cooling capacity, Boiler BTU output, and blower CFM, and ductwork size.  The discussions of the install job was very professional. I have a modest ~2,200 sq ft home and  I asked if it was possible to do multiple zones, being that two of the zones would be <300 sq ft.  They said no problem, the variable speed blower would handle it fine. They said they do the many tests (Manual J, D, S etc...) needed to size the system perfectly.   I also indicated that I do not want blowing air noises from ductwork, I wanted quiet operation.  And, wanted plenty of hot water as we have 2 baths that are used concurrently in the mornings.  And, I was willing to pay an upcharge for better efficiency, to save $$ in the long run. Danisi said they could give me this; none of this was a problem.  I hired them because everything they said sounded as if they knew how to design the system properly.  Unfortunately, it wasn't until I did much reading after my renovation was complete that I realized how little they know.  This company has no idea how to properly size a system.
 I have a modest ~2,200 sq ft home with all new batt insulation, doors and windows.  They sold me a fixed output 200 MBH condensing boiler. This is WAY oversized for my home as I had read, and experienced. I had asked for a variable output boiler, they said don't waste your money. My home was divided into 4 separate thermostat controlled zones; this is when you want a variable speed boiler as there will be small area heat calls!  They said pay extra for the condensing model, that will save fuel. But, the boiler is so oversized that the return back to the boiler is way to high in temperature that no condensing occurs in the unit. 24hrs running with o/s temp ~25 avg degrees resulted in only a few tablespoons of water, which proves the unit is vastly oversized.(2 years later I switched to a variable boiler, and then got a small bucket of water each day. It was condensing!)
They sold me a 36 gal indirect water tank. I asked to upsize it as I have 2 baths & 2 teenagers. Danisi said don't waste your $, this will supply all the water you will need, even running 2 showers and a dishwasher. WRONG! In winter months water gets lukewarm if a long shower was taken first.
When they finished the job I turned on the MBR zone (which is where I had stated I wanted quiet airflow) and the room was noisy! The air out of the floor ducts was blowing my hair up as I stood over it. They cut the airflow down on the air handler control. But as I discovered the following summer the condenser would constantly freeze because of not enough airflow out of the zone (too smalll of a zone being feed by a 2sp 5 ton AC unit). I had to turn up the airflow to prevent the freezing. And the following winter the boiler developed 2 large cracks in the heat exchanger. Caused by too much output being pushed into a small zone, IDK? Utica honered the warranty and would replace it for free, but I would be foolish to put the same unit in again, so I had to pay Danisi an additional $1,200 just to upgrade to Utica's upgrade model that had variable output. They said this was just the cost difference between the models.
Run away from this company, as the owners have no idea how to size a system. They always insisted every component was sized appropriately. Unfortunately, you won't see many negative review, because most homeowners do not realize when their system is oversized. When it's 15 degrees outside on Long Island if a heating unit continually cycles on for 10 only minutes then off it's vastly too large. Danisi does not understand this.
(Also, they did not pull a permit to do my job, My builder had to stop his construction for 3 weeks until they got one, because he was then at the drywall stage.)

They arrived promptly, did the work in a timely manner and were very respectful of me and my property.

I HAVE USED THEM FOR YEARS TO TAKE CARE OF ANY ISSUE RELATED TO MY HEATING SYSTEM. THE SERVICE PEOPLE ARE EFFICIENT AND THE REPAIRS ARE LONG LASTING. I AM HAPPY TO HAVE FOUND A COMPANY WITH SUCH GOOD SERVICE.