The heating unit will start out blowing hot air and then will change over to cold air. If I turn it off for about 5-10 minutes and restart it, then it will blow warm air again and then eventually cold air. This is pretty aggervating, especially on a cold night. I've had it checked out and the guy told me that its what most older units do like that. I think hes full of crap. Any suggestions? By the way, the filter stays cleaned out monthly.
Great answers from the other guys. Oddly enough though this sounds like a normal defrost cycle for a heat pump. By the way, he may be full of crap too. IF this is a gas furnace go with the limit switch. I wouldn't lean toward an anticipator though. Good luck.
You could have a fan/limit control hanging up on your furnace. I am assuming that it is a gas furnace. If it is a heat pump then the air will feel cooler than it does when the electric heaters kick on. In cold temperatures the heat pump does not produce nearly as warm of an air temperature as it does when it is in the 40's. If there is something wrong with the heat pump then it usually blows air in the 70's. Another problem could be that it is sticking in defrost which is air conditioned air. That is really cold air. You need someone that is familiar with your type of heat. Ask friends who they have work on their systems since that is the best way to pre-qualify the technician. Good Luck!
TB is right but does it warm your home to the thermostats setpoint before it blows cool air. My idea of what may be happening is this, if you have a gas heater: The unit ignites and begins to warm the home. Gas heaters have a limit safety swith that will lock out the burners if the exchanger gets too warm. If the air flow is low, then the exchanger gradually gets too hot because there is not enough air flow across it to keep removing the heat. So, when the limit swith finally gets too hot and trips out the burners, well, the thermostat still calls for heat which keeps the blower running. But it is blowing across an exchanger that is not being heated because the burners are locked out. The limit switch does take some time to cool off and reset. In many case, to reset the limit, power has to be turned off then back on. SO..... Check your air filter, if it is dirty, replace it. The cooling coil which is in the air pathway, if it is coated with dirt, this will slow down the air flow. Have it cleaned. If this does not correct the problem, you will need a service Tech.
How long does it blow cold air? On most units, the fan will blow for 30 seconds to a minute AFTER the heat shuts off. This is some sort of safety feature to cool off the heat exchangers. If it just blows cold for a minute and then shuts off, it's normal. Plus, it's not actually blowing cold air, it just feels cold compared to the hot air, but it's still above room temp.
It appears like you ducts are not to any extent further insulated and run in an attic or different warm section. They %. up warmth even as the air isn't transferring and then take time to relax off. you're probable dropping a number of your AC skill to relax that area. Have the ducts inspected for lacking insulation and leaks. cover them with 4 fiberglass roll variety insulation in the experience that they are accessible. An HVAC contractor could do the calculation to easily remember to have a large adequate unit for the dimensions of your condominium. you may keep the temperature extra even through operating the fan consistently yet your electric powered bill will flow up (if you're determining to purchase the electrical energy).
