Their customer service is knowledgeable and prompt! Best prices, shipping is fast and when you have a problem it's rectified with speed and no bs! I will be back to buy another generator next month and this is now my go to website!

The correct items were shipped quickly and everything was perfectly smooth! They had great service and great prices so I'll be using ISC for all my HVAC supplies needs in the future.

We paid an additional $100 for urgent shipping. After three calls to customer service to ensure the order would ship out and confirm it would be shipped overnight speed, our order shipped out 5 days after the order was placed and at ground shipping speed. This company may have competitive prices but it will end up costing you more when deadlines are pushed back because of poor communication and lack of attention to detail... Our experience in one word? Frustrating.

I ordered several boxes of filters and one arrived was the wrong size. They would not take a return even though unopened, would not send replacement or even offer free shipping on replacement. Terrible customer service - avoid ISC.

Very good service, and fast delivery

Order placed 8/27/19 for 12 air filters. Yesterday, day 49 I called & order was not completed or in production. Rep said, "I'll call you back." Never did. Today, day 50 called again & rep said I'll call you back. I canceled order. Looking forward to a refund. WHY BOTHER TAKING AN ON LINE ORDER IF YOU CAN'T FULLFILL IT? What a waste of my time & yours.

My orders are processed fast and the customer service is friendly and helpful. I appreciate the email updates from the acknowledgement to the shipping information. It is helpful to know when my product will arrive.

Fast shipping, EXCELLENT price! Great seller. Highly recommend ISC Sales.

Unfortunately my product was not packaged well enough to avoid damage in shipping. Fortunately ISC customer service came through, and paid for me to have it repaired to like new condition. Therefore, and since the product was well made of high quality materials I am happy to bestow the full five stars. THANKS, ISC.

Shipped out next business day. Products came as described. Others had the pneumatic fittings I was looking for but only in bulk quantities. ISC Online had them in singles as well, which was very helpful. Will buy from again.