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Heating, Air Conditioning, Fridge, HVAC/Auxilliary Furnace-Summer Question

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Question
I recently bought a 50 year old home.  It has an addition that is heated by a 10 year old auxilliary Trane furnace with no AC, whole house including addition is AC'd by the main furnace, which is only about 5 years old but it has hard time keeping up with all FSF on hot humid August days.  Both furnaces have fresh air exchanges.   My question it whether in the summer,  I can cover the auxililliary furnace outside flu vent and its fresh air intake,  so there is no hot humid air entering the house through those ducts.  To improve efficiency of main furnace AC.  
(For that matter, in the summer should I cover the main furnace flu vent and fresh air intake?)

Answer
Yes, you can cover without harming the unit...If you have a standing pilot, then be sure it is turned off...I would recommend that the gas and power be turned off.  Then leave a tag on the gas valve as a reminder to remove the covers.  You need to do that so if you are not the one to turn it back on, someone else will be aware of what was done.  You might even forget...

Craig
achelpguy@gmail.com

Heating, Air Conditioning, Fridge, HVAC

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Craig HVAC Expert

Expertise

I have been in the HVAC field for the past 18 years. I can help with most HVAC questions. I work on commerical buildings for the most part, and have yet to find anything I could not troubleshoot and repair, when repairable. I work on small 1 ton units to a 2500 ton chiller. Troubleshoot air flow, elect, and control problems. I attend regular classes to keep up with the latest and greatest.

Experience

I work on commerical sites, hospitals, gov't buildings. I can troubleshoot just about anything in the HVAC business.

Education/Credentials
5 years trade school, VFD training classes, Liebert factory training, some York and Trane factory training.

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