Attic Vent in 5er for Full time?

Searching_Ut wrote:

Old-Biscuit wrote:

Searching_Ut wrote:
Haven't decided what I think of the fully ducted AC yet. Much quieter than any other rig I've owned, but even with two 15k units it struggles a little more than I think it should. Temps were topping 100 when it was struggling though which is tough for any RV. Fair bit of early issues dealer took care of, but seems to be doing good now.

How is the airflow out of ceiling registers?

Have you measured temps of air return vs cold air discharge?
Should be 18*-20* difference if functioning properly.


Our 34' 5th wheel just ONE 15K ducted A/C maintained 70*F in 100*F high humidity temps but would struggle as temps went above 100*F

TWO 15K A/C Units should be chilling.

Unless they are passing (leaking) air between return/discharge or issues with duct work restricting air flow

The air cools down good as indicated by the IR gun, while air flow seems like it could be higher considering only 3 cold air vents and 3 return vents in living room area. As mentioned, I'm still undecided on how good it works. Most camping we've done so far with this rig has been boondock or 30 amp service where it was only getting up to 90's in day. We were camping longer term in these areas and AC had no trouble holding it's own. When we hit the hot areas we were traveling in the day, no hookups till afternoon. Seemed to struggle to get it cooled down even with two AC units. Only thing I can compare with though is much smaller TT's with considerably smaller air volume and surface area to cool down.

Can't get accurate air temps using an IR Gun.

Need a regular thermometer, stick it in discharge duct (closest one or even better right in discharge plenum if you have 'chill grill') and leave it in for a few minutes.

Do same for return air side.

What is the difference between the two?
18-20* A/C is working great

Lower differences......then check if discharge air and return air are mixing -----plenum not properly sealed off