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@vstech and @beenthere thanks for the replies.

Are your recommendations based on comfort and/or economics?

I should’ve made my question clearer,in that I was more interested in the economics...

Thoughts on AC -- set and forget or turn off while at work (8 - 10 hrs) and then have long run time. Usually set AC to 70*. NE Ohio.

Thanks.

Unknown what the duct insulation value is. Ceiling insulation is R-38 batts.

Thanks for the reply.

I would say that a little over 10% of the ductwork is in unconditioned space. Interestingly, the two rooms in question are the second-floor bedrooms that have ductwork...

Thanks for the reply.

That was one of my concerns, based on my readings here, with the continuous fan during cooling and re-introducing the moisture from the coil.

Thanks for the reply.

One probe was placed in the blower cabinet after the air filter rack. The other probe was placed through the coil case, through the Delta plate between the A coil.

The...

Spent time today talking with salesman and installers in our neighborhood regarding uneven temps across our 2 floors and possible solutions. These were the same that were involved with our home 11+...

Thanks.

Any thoughts on why the line of sight to heat exchanger measurement is less than the measurement on the horizontal plenum just after where it changes from vertical?

Thanks for the reply.

Interestingly, the temperature site 18" above the evap coil and in the line of sight of the HX was 8* cooler than the measurement I took on the horizontal plenum just after...

I took the measurement with my probe directly between the A formed by the 2 coil panels.

I read the 2 coil panels form an "A" with a triangular sheet of metal called the delta plate between the...

Sorry, I don't understand this statement's application to my situation? I have not tested my static supply with the blower door off. I have only tested the static pressure both with and without the...

Thanks for the reply.

I took the return static pressure by drilling a hole in the removable access panel of the blower compartment. I also took it several places along the return plenum, before...

Where is the best place to take the supply temp? On the vertical or horizontal plenum? I am getting 2 different measurements.

I changed the blower speed to medium (increased from medium-low). ...

Thanks for taking the time to reply but please READ!!!!

I replaced the capacitor and it has not tripped in 3+ weeks.

I was responding to the other person's questions about how I took the...

Thanks for the reply.

Tested the TESP with probe through a hole in blower compartment and hole through the evap case through the delta plate between the coil panels. Correct?

Originally, I...

Replaced the capacitor 3 weeks ago and the system has run without incident.
Old capacitor was rated 7.5 +/- 10%, capacitance measured at 5.4, (- ~30%)

TESP - .29 without filter, .39 with...

Any thoughts on why the fan seems to ramp up/down with the removal and re-installation of the filter? I can stand there removing and re-inserting the filter and listen to the fan ramp up/down.

At the end of the day, my biggest question is why now - what has changed?

Why am I having this issue now? The only thing that has changed in the 10 years of living here is the increase in size of...

Funny you mention well informed.

When we first moved in, while watching a movie, I would time the on/off cycles during heating and cooling. I would place a tissue over the floor register and use...

Thanks for the reply.

Interesting that you think it is over-sized. Today, when it was running for 90+ minutes recovering from the set-back from 67* to 71* in 33* weather I thought that was a long...

The motor never stops. It continues to operate to cool the unit to below the limit switch. The thermostat will say "heat on" however the furnace LEDs flash limit switch error and the house temp...

After lurking on this site for years, I thought the same thing about the filter size.

However, according to the Lennox G51MP installation manual on page 15, table 3 states that a 16x25x1 filter is...

Additional information, rough measurements of return air grilles (Hart and Cooley 650s); 1,615 in^2 (11.2 ft^2)

Thanks for all the replies.

Some additional information. System ran today for 90+ minutes bringing temp back up from set-back. No issues. Checked about every 5-8 minutes to make sure system was...

Thanks for the reply.

I understand what you are saying about debris bypassing the filter.

However, the system ran fine for 10+ years. The system continues to run fine with a clean filter...

Thanks for the reply.

Lennox G51MP-48C-90; return plenum is 16x25 (filter size); all rooms have return air grilles, which were increased in size this cooling season

3200 sqft

Regarding the...

Thanks for all of the replies. I will try to answer all of the questions in one reply.

The system (furnace and AC) are almost 11 years old. Installed with new construction ~ 5/2006.

All vents...

Yes, have central air also.

My furnace has the lockout safety feature you have mentioned.

The 2 previous instances replacing the filter and turning the power off to the furnace resolved the...

The system has signaled (with the LEDs) primary or secondary limit switch as well as being able to hear the system run the fan while not providing heat despite thermostat calling for heat.
...

Thanks for the reply.

Any ideas why I would be now having an issue after years of using the same filters (Accumulaire) without problem? And, now having issues with the cheapo filters prior to the...

Hello,

Lennox G51 MP, 11 years old.

Do limit switches slowly go bad?

I change my filters monthly. Previously was using Accumulair Emerald 16x25x1, Merv 6 filter. Never had any problem...

What are your thoughts on using circulation mode during the heating and cooling seasons?

Hearing my fan transition from low to high speed with a cooling call sounds like a lot of wear on the...

8" round off plenum, 90* to oval up 2x4 wall cavity, 90* to 8" round, terminating at 4"x12" register.

Thanks again for your time.

Thanks for the reply. It is a standard wall cavity. What size grille could I go up to before the wall cavity becomes the limiting factor?

Thanks again for your time.

Is there a benefit to increasing the size of a return air grille in a room lacking sufficient return? Currently have 6"x14" grille on a wall cavity return.

Thanks.

Thanks, now I think I understand.

So, the amp ratings on the appliances are what they draw per hour. Giving you kW hours.

Thanks again, I appreciate your time and assistance.

I'm comfortable with the correct unit. Unfortunately, I seem to be getting a wide variety of answers.

I would like to be comfortable with your number but I am having a difficult time...

Online generator sites say that the AC needs the 17 or 20 from generac.

Company 1 says Generac 17 at least, maybe 20.

Company 2 says Generac 14 will handle AC no problem.

From Generac...

Actually, 17 and 20 from Generac. I was asking them about the 14 from Kohler based on what I read on Kohler's site. They said I would need 17 at least.

Little if anything. Stove, hot water, furnace, dryer all gas.
Everything else electric is small...furnace blower, fridge, freezer, microwave, dryer motor, washer, power vent for hot water,...

So, the hard start kit would really be of no benefit?
Where does the 6.46 watt hours come from?
7.5kW sounds a lot better on the checkbook than what the generator people were saying was needed....

Thanks for the reply.
So, if my understanding is correct. This compressor requires 23,280 watts to start (240v x 97amps)?

Hello,
Looking to purchase a standby generator for house.
Have Lennox 13ACD Merit Series installed in 2006. Compressor locked rotor amp 97 and condenser fan locked rotor amp of 3.1.
What affect...

Thanks.

Looking into wireless t-stat. Have Lennox GMP-51. Currently have Honeywell FocusPro 5000. Any recommedations would be greatly appreciated.

Thanks for the replies.

I found that my system is set to the defaults...
heating 90 seconds (options include 30, 60, 90, 120, 180)
cooling 2 seconds ( options were 2 or 45s)

Left the heat at...

I am trying to determine if the fan should be running after the compressor stops or if it should stop at the same time as the compressor. Also, curious if the fan should stop at the same time flame...

Is there a standard time that the fan should run after the compressor stops on the air conditioner or during heating season after the flame stops in the furnace? Or, should the fan turn off the same...

Thanks KEY1CC and PSTU, I appreciate the information.

Following the thread "Getting the ESP" and watching the video by HVAC R US 2 I was wondering if anyone could recommend an inexpensive manometer for homeowner use. My curiosity has gotten the best of...