My electric dryer is taking forever to dry and the air coming out of the duct outside is cool what could be the problem?

I may be misinterpreting your complaint, but I think your stating that the dryer doesn't dry properly. If so, the first thing I would check is to see if the exhaust duct is clogged with lint (they need to be cleaned out once a year or the ability of the dryer to dry clothes properly diminishes to zero).

What I do is, I disconnect the duct at the back of the dryer and connect a shop vac to the duct. (The kit comes with a shop vac hose-to-duct adaptor). Then I go outside, and using an cordless drill, attach a special duct cleaning brush to the drill (the kit comes with several extension wands to increase its length) and run the brush through the outside cover and down into the duct. The drill spins the brush, completely cleaning the interior of the duct. You can buy the brush at any home center, I bought mine at Menards.

Example: Amazon com Deflecto Dryer Duct Cleaning Kit Extends Up To 12 Home...

After I'm done, I'll also use the extension pipe on the shop vac and push it up into the dryer itself to clean out that part of the exhaust.

If you neglect to clean the duct, the dryer will eventually take forever to dry clothes and they will still come out damp.

The most common problem for a dryer to take more than one cycle to dry is restricted air flow.

1.when the dryer is running go outside and find where the venting is located, there should be a good amount of air flow.
2. if the air flow is not good look at the ducting coming from the back of the dryer and make sure it is not kinked or pushed back to far.
there is usually lint build up some where along the ducting or at the end of the duct where it vents to the outside.
3. if you have access to a leaf blower,this can be used to help clear any lint build up inside the duct from the dryer to the outside venting.
move your dryer out and take the leaf blower tube and stick it in the hole and turn it on.
the vented louvers need to be removed from the ouside of the house to allow the lint and things in the duct work to be blown out.

The most common problem for a dryer to take more than one cycle to dry is restricted air flow.

1.when the dryer is running go outside and find where the venting is located, there should be a good amount of air flow.
2. if the air flow is not good look at the ducting coming from the back of the dryer and make sure it is not kinked or pushed back to far.
there is usually lint build up some where along the ducting or at the end of the duct where it vents to the outside.
3. if you have access to a leaf blower,this can be used to help clear any lint build up inside the duct from the dryer to the outside venting.
move your dryer out and take the leaf blower tube and stick it in the hole and turn it on.
the vented louvers need to be removed from the ouside of the house to allow the lint and things in the duct work to be blown out.

The most common problem for a dryer to take more than one cycle to dry is restricted air flow.

1.when the dryer is running go outside and find where the venting is located, there should be a good amount of air flow.
2. if the air flow is not good look at the ducting coming from the back of the dryer and make sure it is not kinked or pushed back to far.
there is usually lint build up some where along the ducting or at the end of the duct where it vents to the outside.
3. if you have access to a leaf blower,this can be used to help clear any lint build up inside the duct from the dryer to the outside venting.
move your dryer out and take the leaf blower tube and stick it in the hole and turn it on.
the vented louvers need to be removed from the ouside of the house to allow the lint and things in the duct work to be blown out.

The most common problem for a dryer to take more than one cycle to dry is restricted air flow.

1.when the dryer is running go outside and find where the venting is located, there should be a good amount of air flow.
2. if the air flow is not good look at the ducting coming from the back of the dryer and make sure it is not kinked or pushed back to far.
there is usually lint build up some where along the ducting or at the end of the duct where it vents to the outside.
3. if you have access to a leaf blower,this can be used to help clear any lint build up inside the duct from the dryer to the outside venting.
move your dryer out and take the leaf blower tube and stick it in the hole and turn it on.
the vented louvers need to be removed from the ouside of the house to allow the lint and things in the duct work to be blown out

The most common problem for a dryer to take more than one cycle to dry is restricted air flow.

1.when the dryer is running go outside and find where the venting is located, there should be a good amount of air flow.
2. if the air flow is not good look at the ducting coming from the back of the dryer and make sure it is not kinked or pushed back to far.
there is usually lint build up some where along the ducting or at the end of the duct where it vents to the outside.
3. if you have access to a leaf blower,this can be used to help clear any lint build up inside the duct from the dryer to the outside venting.
move your dryer out and take the leaf blower tube and stick it in the hole and turn it on.
the vented louvers need to be removed from the ouside of the house to allow the lint and things in the duct work to be blown out.

Frequently there's an obstruction in the vent duct from the dryer to the outside of the house. For the dryer to heat properly, the duct must be clean and clear of lint or any other substance.

the most common problem is air flow restriction.make sure the machine is not pushed back to far and the ducting is getting kinked or blocked some how.when the machine is running go to the outside of your home and feel for the air blowing out of the dryer it should be pretty strong if it is not then there is a restrtion in the main line somewhere.and a leaf blower can be used on the inside of the house by sticking the tube in the vent hole and blowing it out but make sure that the outside part of the venting is clear so anything in the main line can come out.

The spark ignitor maybe at fault. Listen for the clicking noise upon starting it up the first 30 seconds it runs. If not heard it is in need of a replacement

you better not use the dryer again until you can clean the entire vent system-----not just the lint filter , but the back of the dryer and the complete exhaust duct all the way to the outside. It is probably plugged. Also check to make sure nothing is blocking the air intake. I know a co worker who had a house fire due to a blocked vent. After the vent is clear, make sure you can feel a good stream of air coming out at the outsde of the vent.