It's either the compressor or it's out or low on freon. You have a fan motor which blows and a compressor that cools. If you can hear the compressor go on, your out of gas. If not it could be as simple as a capacitors or more involved.
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Its probably not the thermostat. The air conditioner may be stuck on heating mode. If its a reverse cycle, the reversing valve may be jammed so even when the thermostat is calling for cold air, it stays on heat. If the machine is on heating mode, it should be blowing cold air out of the outdoor unit of the air con. If its on cooling mode, the outdoor should be blowing hot air.
Heat pumps defrost which is the AC mode, if the heat strip isnt working during a defrost, the air will be cold, A heat pump only feels warm if the heat strips are on too! the refrigeration cycles heat output is much less sensible to our 98F skin. heat pumps that satisfy a room setpoint are working at least, all heat pumps feel drafty to most.
Find a reputable HVAC contractor to do a
room by room analysis with heat and cooling loads calculated and units
sized and duct requirements and compare to what you have.
The air not being cold is not necessarily an indicator of anything
malfunctioning. High efficiency units for instance don't produce cold
Since you have had someone look at it, the duct
work may be collapsed which restricts air flow or uninsulated which
warms up the supply air. Either one is a possibility. Any Cox Cable guys
been stompin' around your attic lately? Wouldn't be the first time.
Usually, when the air coming out of the vents is not cold enuf it's because your freon level is low. Probably leaking, but they can usually recharge the freon and it will work for a while. Try another repair company and see if they can recheck the freon level.
We have a high efficiency unit and it produces cold air, so I don't know what previous poster is referring to. Air conditioners are supposed to blow cold air.
Sorry, to tell ya but it is normal if the outdoor temperatures are much
below 45 degrees. Below 45 degrees there is little heat outdoors for the
heat pump to grab to heat the home so it will run 24/7 and blow cool or
cold air. Below 45 the temp of the air coming out the vent will decline
and you will get no heat from the heat pump itself as you near
Your emergency heat or auxiliary heat is electric strip heat. But it
only kicks in during normal operation if the temp in the house drops 3
degrees below the setting. (some tstats if can be 5 deg.) Otherwise the
heat pump will blow cool or cold air the rest of the time if it is too
To prevent it from running all the time and blowing cold it is
recommended if the temp outside is falling below 45 degrees you should
just switch to the emergency heat setting, which shuts the pump outdoors
off, and just heat with the electric.
But if there is no heat outside the heat pumps will blow cold. They are
the cheapest and most efficient forms of heat but only as long as the
outdoor temp is above that 45 deg..
I'm guessing that if you haven't experienced this you live in some place
with moderate winter temperatures like in Northern Florida and rarely
get very cold winter temps like the freezing you have seen there
It will likely blow much warmer when the outdoor temp rises.
Does this problem happen when the temperature is below 30 degrees? When it gets about that cold outside, the air outside is too cold for the heat pump to "steal" heat from. On the thermostat you'll find a switch labeled aux or emergency heat. Turning this switch on will operate a traditional coil heater inside the system, providing you with heat. The only downfall to this is that it uses more energy to heat this way. Try turning the fan switch from "auto" to "on". If the fan comes on, then we can rule that out. If the aux heat switch is NOT on, set the thermostat such that the system will try to heat. If the outside unit is running, the problem is either it being too cold like I said earlier, or there's a problem with the heat pump's mechanical system that needs to be serviced by a professional. If the outside unit doesn't run but it should be, check it's breakers at the panel, the breaker inside the electrical box that feeds it, and look to see if there's a reset button on the unit itself. Finally, check the air handler (part of the system inside with the fan in it) to see if there's any circuit breakers or fuses on this unit. Make sure they're not tripped/blown. If none of this helps, you definitely want to get a pro to work on your system.
If it does not have a furnace or heating elements for heating, then it is a heat pump, which is rare for a central AC system, but makes sense of the fact that it blows warm air when you reset the pressure switch, which may indicates freon pressure charge problem if your AC system has a reverse valve and uses freon to for heating (heat Pump).
Do you get heating when outside unit runs? if you do, check freon pressure levels and top up to required pressures. The button you depress is a pressure reset switch ... that is if your AC system is a heat pump ... which, as pointed above, it is not common for central ACs.
If your unit is blowing heat inside and it's not a heat pump. It will be most likely electric heat in your case.
Sounds like you have a split unit meaning the condenser is outside and the cooling and the heat features are inside or under your home.If your Rudd is a heat-pump the outside unit will cycle/blow cold air outside in winter and hot air will cycle/blow outside during the summer season. Now, if for some reason the heat is not coming on inside the house, would be the only reason that you would need to be concerned. Being a heat relay or breaker of could cause that problem. Hope this helps you, Sea Breeze