My Wagner is a bit quieter than my Harbor Freight but I prefer the HF gun. I usually have the radio on when in my shop and I can hear it OK from my bad ear. As far as trying it in the living room while watching TV, I prefer the happy wife = happy life scenario and I am confident that running the heat gun in the LR to watch TV would result in Un Happy wife.
If I felt it necessary to watch TV while PC I would really look into the infrared ceramic bulbs as they make zero noise, Research indicates that most heat guns are around 50Db at your ear but I know that when I have mine running it is hard to carry on a conversation.