Honda Civc 2007 LX 4 door sedan

in Honda
Hello. I own a 2007 Honda Civic LX, 4 door sedan. It has over 127500 miles on it. A week or so ago i started to notice this whistling / humming noise coming from the passenger side vent. Yesterday, i noticed that the temperature (heat) is relatively low. Does anyone know what is going on with my car? Helpful tips / diagnosis would be greatly appreciated. I am new to online discussions 
Joe

Joe
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I hate to throw yet another "something new" at you, but this question might be a good fit for our Answers section. Several members with mechanical expertise hang out there.
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