Something everybody needs to watch out for is where they buy things online. There are various sites where sellers are not genuine at all. There are people who do what is called drop shipping just to make a profit. They basically opportunity an typical online vendor enjoy walmart or home depot, & they will send you whatever you buy from those vendors. So you make your purchase through them, they buy it from the other vendor & it goes to you. They usually mark these shipments as a gift so that there is no receipt for how much money was paid. This is exactly what happened to myself and others recently when I wanted to get a couple of window cooling system units to my loft in a hurry. It was an overheated Summer & the cooling system system was struggling. I decided to look online for window cooling system units when I couldn’t find any at the stores. I was ecstatic to get my window cooling system units delivered to my home, however I was surprised that they arrived in walmart boxes. I thought I didn’t buy anything from walmart, & then checked walmart to see the window cooling system units. They were significantly cheaper on walmart’s online store, & the woman I purchased them from charged myself and others $50 extra per window cooling system unit, so she made $100 dollars off me! I complained to this woman however she said it was perfectly legal to do that. The worried thing is, it’s not technically against the law, so be easily careful where you purchase things enjoy HVAC equipment or air filters online.