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Wow, a heater repairman that thinks furnaces go into stage 2 heat after ten minutes.

I'm stuck with the company that did the install so I have to work thru it. The number of hack jobs is ONE. The wrong equipment and initial single return air added to level 2. Red flags don't...

These are random log screen shots of playing with the nest thermostat, varying conditions, pre and post duct work as well. Not to read into the logs but just to see the example.

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Nest version 2 thermostat supporting 2 stage heat and 2 stage cool. Locked user access for temp range 68-72 heat. Not in learning schedule mode and away disabled.

Great point. The units are not zoned but at the same time there is nothing that prevents tenants from closing
off their vents and thereby restricting airflow.

Here is where I am at:

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So the new duct work is added, that is the 3 supplies on the upper level from a 10 in spiral ducts (right). The 12" return (left) was done before. So all of this...

right now there is a 4 ton 16 seer 2 stage unit installed that will be replaced as well. Kinda hard for me to see it go. But also equipment hight including this efficient coil make the unit too...

I don't have all the data just discussion. The static pressure was high based on insufficient place to relieve the air. On the main level there is a large return panned between two joists with a 10...

A 12" diameter return was previously added to the 2nd level.

Correction the heat load was not 75K but rather heat calc indicated I need a 75K unit after efficiencies and altitude were considered.

The factory default for this furnace on page 47 in figure 44 for jumper P7 is "none" and will never go into high fire unless a two stage thermostat calls for high fire. If the jumper is set to...

Forced company to do a complete analysis. Manual J said I only had 900 CFM ductwork capacity and heat load needed was about 75K. Three new supplies are being added to the upper level to enable 500...

Tomorrow (Friday Jan 1) I meet with the sales and installers at the premises.

Based on what I have learned here I should ask for the following.

Since I am at a mile high how much does that...

Thanks for the info. Having 5 ton capabilities does not mean it is operating at 5 ton as I understand it. Even the next two sizes down have 5 ton "capabilities". Due to height restrictions they...

OK so still sizing up my options before I go back the the contractor. One fear I have is, lets say the 105 is replaced with the 75K BTU unit. And then stage one runs shortly (12-15 as ROBO says)...

beenthere: Thank you this is indeed helpful. I will go back in about a week and they guaranteed up front in writing that they will change the equipment out if I am not satisfied so I need to gather...

As I said in my initial post, a 162K BTU Thermopride furnace was displaced.

The system is not 100% ducted for a coal furnace. There are additions to the property of 500sq ft served by the same...

Not true

I'm not seeing high fire unless I turn the t stat up about 3 degrees. If I leave the t stat at 70 degrees and it is 30 degree nights and 50 degree days the duty cycle is about 33 percent. Roughly...

I eat yummy crow and humbly apologize. The product specifications in another marketing document says high heat 1604 and low heat 1400. But I do not see that high of speed in the manual except for...

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The furnace is using BOTH stages, only stage 2 if I make like a 3 degree delta T call for heat. Or at the tail end of a run. I am using the NEST thermostat generation 2 that...

I do not believe your statement to be true. Is it possible you could provide some facts here. I am not an HVAC tech but I read the manual in the sections for setting the CFM and temperature rise...

So, setting aside the duct capabilities, CFM for one moment and we just talk about energy. If the heat loss calculation for a property is 60K what size of a 2 stage furnace is optimum? Sized to...

What is very frustrating to me as a consumer is I was up front with what I wanted. In that I wanted a quiet low running system and did not want it to be oversized. Amazing I had 5 bids from...

100% Agree. It appear to be the wrong equipment. For heat loss, cooling as well as probably for the duct size.