Comments on: My Big Fat Oversized Air Conditioner https://www.energyvanguard.com/blog/my-big-fat-oversized-air-conditioner/ Building science knowledge, HVAC design, & fun Sun, 23 May 2021 18:33:01 +0000 hourly 1 https://wordpress.org/?v=6.6.2 By: Donald B https://www.energyvanguard.com/blog/my-big-fat-oversized-air-conditioner/#comment-7550 Sun, 06 Sep 2015 20:44:57 +0000 http://energyvanguard.flywheelsites.com/?blog_post=my-big-fat-oversized-air-conditioner#comment-7550 In reply to Tom S.

Tom S: If the A coil is
Tom S: If the A coil is freezing up, the correct solution would be to increase the fan speed to prevent it from becoming so cold which makes the condensation form ice. A high fan speed would provide greater air flow through the coil and increase the coil temperature. Reducing the fan speed would only make the problem worse. (Less air flow even colder coil.)

]]> By: Tom S https://www.energyvanguard.com/blog/my-big-fat-oversized-air-conditioner/#comment-7549 Sun, 06 Sep 2015 19:39:10 +0000 http://energyvanguard.flywheelsites.com/?blog_post=my-big-fat-oversized-air-conditioner#comment-7549 I have a 2400 sq ft house (up
I have a 2400 sq ft house (up and down) with a 3 ton AC unit (3 years old) installed by the previous owner. I can’t get the temperature below 78 in the house. Tech came out and confirmed the unit was poversized but operating properly with correct amount of refrig. He concluded the A cool was freezing up. He reduced the fan speed but that only helped a little. What can I do besides replacing the unit?

]]> By: Allison Bailes https://www.energyvanguard.com/blog/my-big-fat-oversized-air-conditioner/#comment-7548 Wed, 18 Feb 2015 23:25:27 +0000 http://energyvanguard.flywheelsites.com/?blog_post=my-big-fat-oversized-air-conditioner#comment-7548 Lee H.:
Lee H.: ASHRAE changed from the 97.5% and 2.5% numbers based on the hours only in the heating season or the cooling season, and now the hours are design temperatures are based on all the hours of the year.

]]> By: John Proctor https://www.energyvanguard.com/blog/my-big-fat-oversized-air-conditioner/#comment-7547 Wed, 18 Feb 2015 23:18:10 +0000 http://energyvanguard.flywheelsites.com/?blog_post=my-big-fat-oversized-air-conditioner#comment-7547 @ Bonnie We cannot tell if
@ Bonnie We cannot tell if the unit is too large (except that they almost always are) without knowing the climate your home is in, the insulation, windows etc. If the air conditioner runs very short cycles when it is a maximum temperature outside, then it is oversized, but we cannot tell how much. If you are in a wet climate, then a dehumidifier should do the trick. I am not sure you need a ventilation system.

]]> By: Lee Hammond https://www.energyvanguard.com/blog/my-big-fat-oversized-air-conditioner/#comment-7546 Tue, 10 Feb 2015 01:23:44 +0000 http://energyvanguard.flywheelsites.com/?blog_post=my-big-fat-oversized-air-conditioner#comment-7546 Just recently started reading
Just recently started reading your blog, really good information. I wanted to question the ASHRAE 1%, I believe it is stated as 1% of the hours from June through September, so less than 30 hours total instead of 87 hours.

]]> By: Bonnie https://www.energyvanguard.com/blog/my-big-fat-oversized-air-conditioner/#comment-7545 Mon, 09 Feb 2015 23:35:30 +0000 http://energyvanguard.flywheelsites.com/?blog_post=my-big-fat-oversized-air-conditioner#comment-7545 My one story attached villa
My one story attached villa is an interior unit and a very tight house. It’s only 1123sq feet. What is the right sized unit I should have for my home? My son and I have experienced high humidity in the home and breathing problems. We are ab out to spend 5k to have a dehumidifier/ventelator because we have been told we are suffering from tight house syndrome. Would downsizing my HVAC unit solve that problem?

]]> By: Ken https://www.energyvanguard.com/blog/my-big-fat-oversized-air-conditioner/#comment-7544 Sun, 04 Jan 2015 13:28:08 +0000 http://energyvanguard.flywheelsites.com/?blog_post=my-big-fat-oversized-air-conditioner#comment-7544 Try lower blower fan setting.
Try lower blower fan setting. It will surely work.

]]> By: Lee Hammond https://www.energyvanguard.com/blog/my-big-fat-oversized-air-conditioner/#comment-7543 Thu, 30 Oct 2014 01:19:36 +0000 http://energyvanguard.flywheelsites.com/?blog_post=my-big-fat-oversized-air-conditioner#comment-7543 I am not familiar so much
I am not familiar so much with the Manual J, but in commercial building ASHRAE calcs the 1% is applied to 4 months summer hours, June-September. So the design temp is exceeded 29 hours instead of 87.

]]> By: Jamie https://www.energyvanguard.com/blog/my-big-fat-oversized-air-conditioner/#comment-7542 Thu, 02 Oct 2014 06:00:26 +0000 http://energyvanguard.flywheelsites.com/?blog_post=my-big-fat-oversized-air-conditioner#comment-7542 The carrier infinity system
The carrier infinity system has a thermostat that works off both temperature and humidity. Honeywell also has several options.

]]> By: Bob https://www.energyvanguard.com/blog/my-big-fat-oversized-air-conditioner/#comment-7541 Tue, 23 Sep 2014 04:36:14 +0000 http://energyvanguard.flywheelsites.com/?blog_post=my-big-fat-oversized-air-conditioner#comment-7541 Something isn’t right, not
Something isn’t right, not sure what. If temps are so mild you only need heat 1 month a year, a 50k should heat the house. Oversizing won’t hurt too much, since it’s only 1 month per year you use it. Did the 100k ever run ALL NIGHT or does it just give a quick burst of heat to warm things up in he morning?

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