Ducts Or Ductless? - HVAC - DIY Chatroom Home Improvement Forum
Advertisement


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > HVAC

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Like Tree2Likes
Reply
 
Thread Tools Search this Thread
Display Modes
Old 04-17-2020, 07:40 PM   #1
Member
 
Join Date: Jul 2012
Posts: 81
Rewards Points: 168
Default

Ducts or Ductless?


If you had an unfinished second floor that you were now going to finish. Would you run traditional ductwork or mini-split the entire house, upstairs and down?
mjhaston is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 04-17-2020, 07:51 PM   #2
Member
 
Join Date: Nov 2014
Posts: 5,836
Rewards Points: 716
Default

Re: Ducts or Ductless?


Depends on a lot of factors.
Do you have cooling now on the first floor?
What is the climate in your area?
roughneck is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 04-17-2020, 07:53 PM   #3
Member
 
Join Date: Jul 2012
Posts: 81
Rewards Points: 168
Default

Re: Ducts or Ductless?


I'm using window and wall units on the first floor. I'm near Philly. I think you're Delaware? So you know it can get soupy.
mjhaston is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 04-17-2020, 08:00 PM   #4
Member
 
Join Date: Nov 2014
Posts: 5,836
Rewards Points: 716
Default

Re: Ducts or Ductless?


In that case, either would work well.
Most important thing is it’s sized well. To deal with humidity.
Could even do a VRF heat pump for both floors.
roughneck is offline   Reply With Quote
Old 04-18-2020, 05:36 PM   #5
Member
 
Join Date: Jul 2012
Posts: 81
Rewards Points: 168
Default

Re: Ducts or Ductless?


I've got 3 estimates for mini-splits. 2 of them call for 1 outdoor condenser. Why would the other call for 2 outdoor units?


#1
Outdoor 1 (Right): 20,000 Btu Multi Zone Hyper Heat Pump Model: MXZ-2C20NAHZ
Indoor 1 (2nd Floor BR): 9,000 Btu Air Handler Model: MSZ-GL09NAU1

Indoor 2 (2nd Floor): 15,000 Btu Air Handler Model: MSZ-GL15NAU1
Outdoor 2 (Right): 18,000 Btu Single Zone Heat Pump Model: MUZ-GL18NA
Indoor 3 (Living Rm): 18,000 Btu Air Handler Model: MSZ-GL18NAU1


----------

#2
Condenser - Supply and install one (1) Mitsubishi® high efficiency MXZ suitcase style side
discharge outdoor condensing unit. The MXZ-3C30NAHZ outdoor unit uses Inverter Technology (Variable Frequency Drive) to provide exceptional indoor cooling and heating comfort. By responding to indoor temperature changes, this system reduces power consumption by varying the compressor speed for extra energy savings. The system performs only to the levels needed to maintain a constant and comfortable indoor environment. To be installed on a stand at the back of home.


----------

#3
Install Bryant Heat Pump 3 indoor wall mount unit with 1 outdoor. 2 up stairs in the
attic space( 12,000 btu, 24,000btu). 1 down stairs on the main floor (24,000btu).


Indoor Units - Supply and install two (2) Mitsubishi® high wall mount indoor evaporator units.
One MSZ-FH12NA to be installed in the living room, and one (1) MSZ-FH18NA to be installed in
the 2nd floor back living room. Computerized control removes excess moisture without lowering
the temperature, providing healthier, more comfortable air conditioning with greater economy.
mjhaston is offline   Reply With Quote
Old 04-18-2020, 06:41 PM   #6
Member
 
user_12345a's Avatar
 
Join Date: Nov 2014
Location: Canada
Posts: 12,445
Rewards Points: 48
Default

Re: Ducts or Ductless?


If ductwork can only be run in the attic and you don't want to insulate the roof deck, go mini-split. it's worth it just to reduce efficiency loss.

Do keep in mind mini-splits are loaded with proprietary electronic components and maintenance costs can be very high out of warranty.

If a circuit board goes bad when the unit is 12+ years old and costs $1000, it can make more sense to just replace.

Wheres a gas furnace has relatively cheap parts unless you buy a high end unit.

This is also applicable to inverter central heatpumps - but if you don't have natural gas available and want to heat with a heatpump, having proprietary expensive components can be worth it to get full heating capacity down at low outdoor temps and avoid using aux heat.
__________________
I am not in the business of any trade I give advice on. I have non-professional hvac experience + good knowledge of theory. Attempt repairs at your own risk. Never jump out safeties - especially pressure switches - on a furnace for testing with fuel supply on; use a meter. Do not troubleshoot with live line voltage present unless there's no alternative.

Last edited by user_12345a; 04-18-2020 at 07:08 PM.
user_12345a is offline   Reply With Quote
Old 04-18-2020, 07:06 PM   #7
Member
 
Join Date: Nov 2019
Location: NY and FL
Posts: 2,556
Rewards Points: 5,128
Default

Re: Ducts or Ductless?


I like mini-splits but I have a ducted system because it is quieter.
Old Thomas is offline   Reply With Quote
Old 04-20-2020, 05:33 PM   #8
Member
 
Join Date: Jul 2012
Posts: 81
Rewards Points: 168
Default

Re: Ducts or Ductless?


I'm tearing off the old siding and sheathing of my exterior. I can have the walls open to the studs. Could mini-split drains and whatever else be run inside the walls so I don't have those large covers all over the outside of the house?
mjhaston is offline   Reply With Quote
Old 04-20-2020, 05:38 PM   #9
Member
 
Join Date: Nov 2014
Posts: 5,836
Rewards Points: 716
Default

Re: Ducts or Ductless?


Yes they can.
Just avoid joints on refrigeration piping within the wall if possible.
roughneck is offline   Reply With Quote
Old 04-20-2020, 05:39 PM   #10
Member
 
user_12345a's Avatar
 
Join Date: Nov 2014
Location: Canada
Posts: 12,445
Rewards Points: 48
Default

Re: Ducts or Ductless?


the lines will have to be well protected from screws/nails.
__________________
I am not in the business of any trade I give advice on. I have non-professional hvac experience + good knowledge of theory. Attempt repairs at your own risk. Never jump out safeties - especially pressure switches - on a furnace for testing with fuel supply on; use a meter. Do not troubleshoot with live line voltage present unless there's no alternative.
user_12345a is offline   Reply With Quote
Old 04-20-2020, 05:43 PM   #11
Member
 
Join Date: Jul 2012
Posts: 81
Rewards Points: 168
Default

Re: Ducts or Ductless?


Quote:
Originally Posted by roughneck View Post
Yes they can.
Just avoid joints on refrigeration piping within the wall if possible.
So are you saying the drain can go in the wall, but not the refrigeration line? Does that go to the outside unit? I'm hoping all could be hidden, but if not I guess it's ok. I'm just using some nice Hardie Plank siding and would like to keep it pretty clean looking.
mjhaston is offline   Reply With Quote
Old 04-20-2020, 05:47 PM   #12
Member
 
Join Date: Jul 2012
Posts: 81
Rewards Points: 168
Default

Re: Ducts or Ductless?


Everyday I seem to go back and forth with ducts vs ductless. If I go the duct route I'm looking at $10k and $3k for additional baseboard heat tied into the existing. I just got a quote of $14k for Mitsubishi all around. 6 indoor (2 of them hyper heat) and then 3 outside units.

I'm told I could run all the mini splits for heat as well and save on my oil, until it gets below 35 and then only my hypers will work. That's a plus.

Some have suggested a duct system is cheaper to maintain down the road.

I have to make up my mind soon!
mjhaston is offline   Reply With Quote
Old 04-20-2020, 05:48 PM   #13
Member
 
Join Date: Nov 2014
Posts: 5,836
Rewards Points: 716
Default

Re: Ducts or Ductless?


Refrigerant lines can go in the wall.
roughneck is offline   Reply With Quote
The Following User Says Thank You to roughneck For This Useful Post:
mjhaston (04-20-2020)
Old 04-20-2020, 05:54 PM   #14
Member
 
Join Date: Jul 2012
Posts: 81
Rewards Points: 168
Default

Re: Ducts or Ductless?


Quote:
Originally Posted by roughneck View Post
Refrigerant lines can go in the wall.
I misread your post. Thanks.
mjhaston is offline   Reply With Quote
Old 04-20-2020, 05:56 PM   #15
Member
 
Join Date: Nov 2014
Posts: 5,836
Rewards Points: 716
Default

Re: Ducts or Ductless?


What user was saying was make sure the utilities going on the wall are protected from nails and fasteners.
Trying to find a refrigerant leak in a wall caused by an errant nail is extremely difficult. And time consuming.
It’s also a fairly common problem.
roughneck is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





Top of Page | View New Posts