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Heat strips are 100% locked out. I never want them coming on EVERY. They dont even come on during defrost

Last summer it hovered around 50%. Thats too high for me at 75*. There are plans for a ventilating dehumidifier but I think the more pressing issue is making sure the ductwork, which is in the...

Recovery isnt a problem, It can recover 2-3 degrees in no time. The only concern is efficiency.

The schedule is set for 66 night, 68 day. Any warmer and its borderline hot, especially when you...

I got a Daikin Fit and love it. I got it working perfectly now but my issue is that we like to sleep in cold like 66 but I like to be warm around 69-70 when I'm up. (heating)

Summer time is...

correct me if I'm wrong. With an inverter system the compressor produces lower LL pressure with the unit say... calling for 25%? So this is the area that flash gas would be the most noticeable?

removed

Should I build a room just around the unit? That might be possible but not for the ductwork.

That cant happen. Due to the slope no one has wanted to foam it. Unit cant do in the basement either as Id have no room. This house was never intended to hvac. Id love to get my equipment in...

LL is LL. EEV in the AHU.

I have been wondering how many of you guys run across gas flashing in the liquid line before getting to the metering device in hot attics? If so how did you know? What were the customer complaints?...

subbed and I'll watch this later!

The duct in the attic is almost R-8 with silver foil except for 3 runs that R-6 black. Does that black actually make that much difference?

Good idea about the HEPA and charcoal filters.

I wouldnt mind putting the Dehu on my vents but they are in an unconditioned attic.. Wouldnt the air get cold or hot coming though the vents? Thats one complaint I have now but I cant do anything...

The basement door is normally left open. The only time its closed if some of our friends bring over their kids. We close is so its safe for them to play all they want. Even with the door open the...

The basement door is normally left open. The only time its closed if some of our friends bring over their kids. We close is so its safe for them to play all they want. Even with the door open the...

I have not made any movement on this but I have been monitoring my Humidity and my CO2. Even when we are on vacation and the house is closed up the CO2 is still around 1200ppm. With 2 windows...

So drywall is a moisture permeable material? Even with paint?

I was looking through the Manual T book. I see where it says round ceiling diffusers are almost useless on slab heating. I didn't see anywhere in the book about how they perform over a heated...

Florida and North Carolina have R32 units now. I know of a minisplit near me that's using it. Its a Daikin Atmosphera, its absolute a beast and very efficient. You have to take classes in order to...

I have 2 20x25 return grille filters now for the main level system. Downstairs where the mini is I have a Winix air purifier I bought years ago and its extremely quiet but I doubt its filtering well...

How would I duct that? I have a minisplit in the basement but I need a decent amount of fresh air down there also.

I have 1128sqft upstairs and ~700sqft downstairs in a finished basement. I have 4 humans 3 dogs and 4 cats... (don't judge, almost all were rescues from neglect.) This weekend, as most days or...

I have spec'ed a 5KW but I may tr to do 2 5KW heaters and see if I can get them to only use 1 unless thermostat is X degrees below setpoint.

Running 100%? No clue but my old 3 ton ran pretty...

My electric usage for summer 2021 was July 1887KW, august 1816kw but we also went to the beach that month, and 1782 for sept, October was 1198kw.

The older system kept running and kept temp at 74 as long as we didn’t open up the doors and kept blinds closed, and didn’t cook. Inc enough started cooking and had a few people over it would raise...

The old air handler had a Model number that correlated to a 10KW heat strip (if that was correct). soooooooooo That thing kept up just fine when it was 0-2* and windy outside. December 23rd was when...

Doing multiple load calcs on loadcalc dot net. I have done everything possible but I cant get 2.5 tons sized right. I was told by my contractor that they size for cooling and then depending on...

I have lived here for 7 years and the past 3 summers have seemed to be warmer then the previous ones. I don’t think the old unit had any issues such as cooling went. Deltas we’re good, filters kept...

No clue exactly because I can’t find the submittals for my particular revision. Outdoor of one is DZ17VSA301AA and the (newer?) model is DZ17VSA301BA I think. And they only have the ones for the B...

3500 heating degree days, 1500 cooling degree says
ACCA design temp for summer is 90-92. Used to be 89 but a lot of energy raters are agreeing it has gone up. Heat design temp is 15 in the city but...

Yup. That’s my problem, I over analyze.

Idk about adjusting coil temps but I can trim the air in cooling mode to -15% and I have 4 different cooling profiles to pick from.

My loads are alway a bit lagging is what I been told. I have a brick home and is seems the load spikes around 3-6 in the afternoon. Seems brick take a bit to warm up and then when it does it carries...

Load calc dot net came up with 29k btus cooling came in at 21k

1128 sqft ranch with about 400sqft above unheated garage 47x24 I think. zip code 24012 house faces ENE build 1972. Its a Modukraft...

So size it to AC and then use electric strip heat at $0.16 cents per KW? What savings would I be left with after that? My problems is that I can find anyone that gives a consistent Load calc. Ive...

Oversizing by how much? Im trying to get someone to do a real heating load calc to find out how much savings I will and wont get depending on which unit I get. Here is my heating and cooling...

I wont be adding onto the space. If anything I will be upgrading windows and adding a screened in porch on the back patio so that will take some solar heat gain away in summer AND winter. I plan on...

I will try that. Still think I should go with the 2.5 ton? Even thought I would be oversized in the summer? Additional power usage?

If I had a gas furnace this would be much easier for sure....

COP for 2 ton at 47* is 4.4 at 5700 BTU min---3.8 at 22,800BTU rated
COP for 2 ton at 17* is 2.6 at 6650 BTU min--2.7 at 14300BTU rated--2.88 at 17300BTU MAX

COP for 2.5 ton at 47* is 4.43 at...

Ahhhh OK. I never thought about that. So for example the unit is rated at 28BTUs but maybe only doing 26K? or less/more?



A side Note and question. The unit is in the attic. I have...

NEEPS cold climate heat pump list.

I have been using this to compare the 2 ton to a 2.5 ton. The 2 Ton looks significantly more efficient in cooling but in heating the 2 ton lacks in the 5 and...

Yes it should. Its not quite 2.5 tons. Also I hope my load calc was correct for my duct work. Says Duct loss is 3800-4250 BTUs depending on which load calc I go by but the duct work is in the attic...

So without beating around the bush I should just size correctly. Another piece of equipment and more power usage. Our electric has gone from 11.4 cents per KW to 15.50 cents in just the last year....

My last load calc cam in at 22k BTUs and that was with me upgrading my single pane windows to typical double pane. Equipment is Daikin DZ17VSA30 paired with a DV36FECC14 AHU. Keep in mind that I...

Is that true for a system that measures humidity and supposedly with run enough to dehumidify.

Should I be sizing a HP for heating or cooling? I'm oversized by a half ton If I sized for cooling.
Things I've heard about this:
--Daikin (Fit) recommends oversizing a size up for heating if in...

Hmmm. I looked at the technical data and it does show that output is quite low at 17* Whats the turndown ratio? I just dont want to be oversized. Even going up to a 1 ton of that model only get...

Main room is 480sqft but there is a laundry room that has not door to the room. Total is 600sqft maybe a little less. I will have no problem cooling this room Load calc says 5500 on the cooling and...

RH isn't a problem in the basement, even with a fish tank down here. Its wild but true.

Has anyone done any calculation on a setback of a 9k BTU minisplit for 16ish hours a day? I am finally getting a minisplit installed in the den/basement and we work normal hours. I would be off...