I have to turn off the central heat/air during harvest else the whole house smells, and even then, it travels. Better to buy a tent.
If you're on a budget, the no brand/off brand tents on ebay/amazon are like ~$70 for a 3x3, $85 for a 4x4, $100 for a 5x5. They work fine, but don't expect the zippers to last more than a year or 2.