The Weekend Thread.

[BobH]

If the temperature is very high as well as the humidity the AC becomes very inefficient from what I have experienced.

Bob

[thebigspendur]

If the temperature is very high as well as the humidity the AC becomes very inefficient from what I have experienced.

Bob

That sounds like a swamp cooler.

With refrigerated air the system has to be matched to the climate and size of the house. Where I am we have single digit humidity and high temperature so you want a big unit that cools quickly. In an area with high humidity you want a smaller unit that will run way longer cause A/Cs are way better at cooling than dehumidifying. You don't want a cool clammy environment so you want the A/C to run longer.

[BobH]

That sounds like a swamp cooler.

With refrigerated air the system has to be matched to the climate and size of the house. Where I am we have single digit humidity and high temperature so you want a big unit that cools quickly. In an area with high humidity you want a smaller unit that will run way longer cause A/Cs are way better at cooling than dehumidifying. You don't want a cool clammy environment so you want the A/C to run longer.

Naw, no swamp cooler in these parts. We don't get a lot of high humidity days here so when we do it does not cool as well. It is difficult to have an AC sized for every possibility is all.

Bob

[STF]

I have a large Maytag A/C unit and I can set the humidity levels for both the summer and the winter when the furnace is on. I didn't set it, the guy that installed it did. I can make it come on just by breathing on the thermostat and watching the humidity climb.

We do have ridiculous humidity here, today we have a severe heat warning that the temp will be mid 30's with a humidex of 45, don't know what that is in F but suffice it to say, hot hot humid humid hot.

[BobH]

I have a large Maytag A/C unit and I can set the humidity levels for both the summer and the winter when the furnace is on. I didn't set it, the guy that installed it did. I can make it come on just by breathing on the thermostat and watching the humidity climb.

We do have ridiculous humidity here, today we have a severe heat warning that the temp will be mid 30's with a humidex of 45, don't know what that is in F but suffice it to say, hot hot humid humid hot.

Yea, that is the big difference between Southern Ontario and NWO, high humidity with high temps. We do get some days like that but as many as southerners.

When I say humidity, I am talking about outside humidity effecting the AC units ability to cool and not humidity in the house. On high outside humidity days the AC will not drop the temp as far as it would on a low humidity day. The air inside the house is not humid just not as cool. Still cool enough to make an appreciated difference.

Bob

[thebigspendur]

Yea, that is the big difference between Southern Ontario and NWO, high humidity with high temps. We do get some days like that but as many as southerners.

When I say humidity, I am talking about outside humidity effecting the AC units ability to cool and not humidity in the house. On high outside humidity days the AC will not drop the temp as far as it would on a low humidity day. The air inside the house is not humid just not as cool. Still cool enough to make an appreciated difference.

Bob

When temps soar and outside humidity goes up A/Cs just have to work harder. If it can't keep things cool and dry it means the unit either isn't matched for the circumstances or it's needs service or replacement.

Commercial units take in outside air so you have a further complication with air balance and negative air flow issues.

I grew up in NYC and summer temps were 90F+ with 70% humidity and in some buildings like movie theaters you would need a coat on in the summer it was so cold.

[32t]

Yea, that is the big difference between Southern Ontario and NWO, high humidity with high temps. We do get some days like that but as many as southerners.

When I say humidity, I am talking about outside humidity effecting the AC units ability to cool and not humidity in the house. On high outside humidity days the AC will not drop the temp as far as it would on a low humidity day. The air inside the house is not humid just not as cool. Still cool enough to make an appreciated difference.

Bob

I don't think that the outside humidity will effect the function of your condenser. If anything it will improve it.

The inside humidity will effect the funtion of your evaporator because it will take the energy for the phase change from vapor to liquid of the water in the air. Look up latent heat of vaporization/condensation for further reading.

Now the higher outside humidity if allowed to enter the house will effect things.

[STF]

When temps soar and outside humidity goes up A/Cs just have to work harder. If it can't keep things cool and dry it means the unit either isn't matched for the circumstances or it's needs service or replacement.

Commercial units take in outside air so you have a further complication with air balance and negative air flow issues.

I grew up in NYC and summer temps were 90F+ with 70% humidity and in some buildings like movie theaters you would need a coat on in the summer it was so cold.

I am always uneasy about those commercial units that take in outside air and have evaporators, there was one of those at the railway depot i was at in Britain and we had a train wash.

I don't know what I got it from but in 2000 I had Legionaires Disease. I was in a coma for 3 weeks, on a ventilator twice, had complete kidney shutdown so had dialysis for two weeks as well as 5 transfusions. My Depot had a collection to help pay for the funeral and give my ex wife some money to help her out after my death. My God it was a scary few months, not so much for me because I was out of it for a long time. Needed speech therapy and physio to learn to walk again because my muscles had atrophied. I was off work for 6 months on full pay when i came out of Hospital.

It's probably more common over here but in Britain, less than 2 people a year get it and the survival rate isn't that good.

[outback]

Check your condensor inside your furnace for blockage.....dust, lint, ect.

Check the flow from your registers, should be able to blow a dryer sheet off of them.

If not, your probably plugged up.

I have to check mine as well. Yesterday was in the 90°f range. AC was set at 72°f, but the inside temp was reading 84°f.

[BobH]

When temps soar and outside humidity goes up A/Cs just have to work harder. If it can't keep things cool and dry it means the unit either isn't matched for the circumstances or it's needs service or replacement.

Commercial units take in outside air so you have a further complication with air balance and negative air flow issues.

I grew up in NYC and summer temps were 90F+ with 70% humidity and in some buildings like movie theaters you would need a coat on in the summer it was so cold.

Did I ever say anywhere that the AC can't keep things cool and dry inside? I said that on hot and humid days the AC will not drop the temp as far as it would on hot and relatively dry days. It is still a lot cooler and dryer than outside and the AC is running almost continuously. To me that means that the AC is less efficient.

Bob