The previous owners put an extension on the house around 2000 (I bought in 2018). Its two stories on slab that abuts the north facing wall of the original house.
Both rooms lose temperature so quickly, which suggests they are under insulated (I know all walls, ceilings have fiberglass insulation and plastic vapor barrier). I have scanned the rooms with a FLIR and didn't find any obvious cold spots or leaks.
The downstairs room is conditioned by a Trane TWE018C140B0 air handler (I think 1.5ton) with a hydroair coil and a single speed fan. The room has three 4x10" registers in the ceiling (room is 15x10x8 ft).
Last night, temperatures dropped below 20F and the heat called every 30 minutes, with run times of only about 10 minutes and the thermostat set to 58F (we aren't home at the moment). This means the room was losing 3F every 30 minutes.
My Theory (lets ignoring the possibility of bad insulation from the slab or in the walls/ceilings):
The blower and ducting are very oversized for the room. So, when the room cools down, the stat kicks in, and the heat blasts. It warms the AIR to temperature and the stat turns off. The AIR then cools down and this cycle just repeats. Because the air warms so quickly (due to the oversize), the objects in the room (furniture etc), which are actually what hold the heat and keep the temp in the room, never really warm up and arent able to maintain temperature.
Does this make sense? I have been scratching my head over this and the local HVAC pro, who installed this system, hasn't been much help.
Both rooms lose temperature so quickly, which suggests they are under insulated (I know all walls, ceilings have fiberglass insulation and plastic vapor barrier). I have scanned the rooms with a FLIR and didn't find any obvious cold spots or leaks.
The downstairs room is conditioned by a Trane TWE018C140B0 air handler (I think 1.5ton) with a hydroair coil and a single speed fan. The room has three 4x10" registers in the ceiling (room is 15x10x8 ft).
Last night, temperatures dropped below 20F and the heat called every 30 minutes, with run times of only about 10 minutes and the thermostat set to 58F (we aren't home at the moment). This means the room was losing 3F every 30 minutes.
My Theory (lets ignoring the possibility of bad insulation from the slab or in the walls/ceilings):
The blower and ducting are very oversized for the room. So, when the room cools down, the stat kicks in, and the heat blasts. It warms the AIR to temperature and the stat turns off. The AIR then cools down and this cycle just repeats. Because the air warms so quickly (due to the oversize), the objects in the room (furniture etc), which are actually what hold the heat and keep the temp in the room, never really warm up and arent able to maintain temperature.
Does this make sense? I have been scratching my head over this and the local HVAC pro, who installed this system, hasn't been much help.
source https://hvac-talk.com/vbb/threads/2235454-Does-this-Theory-about-a-Rm-not-holding-heat-make-sense?goto=newpost
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