Hello and thank you for taking the time to read my post. I'm a new homeowner. I've been having some issues with my current residential HVAC system (house was built in 2021) and I'm hoping this community can confirm the actual issue. A few details to note:
- I have 2 rooms upstairs that are uncomfortably warm in the summertime and too cold in the wintertime. I have 2 carrier units, 2.5 ton for upstairs and 2 ton for downstairs. When the air kicks on, it runs for maybe 7-8 minutes then shuts off and stays off for 8-10 minutes before coming back on. Depending on the time of day, the upstairs feels a bit muggy compared to the downstairs and I thought perhaps the system was shortcycling and not running long enough to remove all of the humidity in the home. These issues have caused me to schedule multiple service calls to my home in an effort to pinpoint what the issue is.
History of events:
1. During inspection prior to closing, the inspector noted both of my units had low refrigerant. The home builder investigated the issue and supposedly "fixed" it.
2. 6 months later, my HVAC service company came to perform spring maintenance on my units. The tech noted both still had low refrigerant. I contacted the builder and the owner came out to investigate. He took readings and said the pressures were fine and he saw no issue.
3. I'm still having temperature issues in the 2 rooms mentioned above, the system is still acting the same (turning on and shutting off excessively) so I called my HVAC service company again and they came out to investigate yesterday. Tech is still saying the refrigerant is low. He said I have low subcooling compared to the manufacturer's specifications (which is stated on the sticker on the units outside); actual subcooling is 1.3 and 1.7 vs manufacturer specification of 10 & 11. Superheat has the opposite problem, it's higher than it should be; 46.1 and 19.4 vs manufacturer's specification of 13.9.
I have pictures of a measurement report that contains a ton of information that I don't understand but because this is my first post, I can't upload it. If needed, I can type it all out manually so please let me know if I should do that. I'm basically just hoping someone can confirm low refrigerant is my problem because the home builder owner is telling me there's no problem while others are telling me I need more refrigerant. Home is still under the initial 1 yr warranty and if the units were never properly charged to begin with, the home builder should front the cost of the refrigerant and not me. Thanks so much for the help!
- I have 2 rooms upstairs that are uncomfortably warm in the summertime and too cold in the wintertime. I have 2 carrier units, 2.5 ton for upstairs and 2 ton for downstairs. When the air kicks on, it runs for maybe 7-8 minutes then shuts off and stays off for 8-10 minutes before coming back on. Depending on the time of day, the upstairs feels a bit muggy compared to the downstairs and I thought perhaps the system was shortcycling and not running long enough to remove all of the humidity in the home. These issues have caused me to schedule multiple service calls to my home in an effort to pinpoint what the issue is.
History of events:
1. During inspection prior to closing, the inspector noted both of my units had low refrigerant. The home builder investigated the issue and supposedly "fixed" it.
2. 6 months later, my HVAC service company came to perform spring maintenance on my units. The tech noted both still had low refrigerant. I contacted the builder and the owner came out to investigate. He took readings and said the pressures were fine and he saw no issue.
3. I'm still having temperature issues in the 2 rooms mentioned above, the system is still acting the same (turning on and shutting off excessively) so I called my HVAC service company again and they came out to investigate yesterday. Tech is still saying the refrigerant is low. He said I have low subcooling compared to the manufacturer's specifications (which is stated on the sticker on the units outside); actual subcooling is 1.3 and 1.7 vs manufacturer specification of 10 & 11. Superheat has the opposite problem, it's higher than it should be; 46.1 and 19.4 vs manufacturer's specification of 13.9.
I have pictures of a measurement report that contains a ton of information that I don't understand but because this is my first post, I can't upload it. If needed, I can type it all out manually so please let me know if I should do that. I'm basically just hoping someone can confirm low refrigerant is my problem because the home builder owner is telling me there's no problem while others are telling me I need more refrigerant. Home is still under the initial 1 yr warranty and if the units were never properly charged to begin with, the home builder should front the cost of the refrigerant and not me. Thanks so much for the help!
source https://hvac-talk.com/vbb/threads/2241253-New-Homeowner-Low-subcooling-help!?goto=newpost
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