Duct cleaning is one of those services where the gap between the best and worst company is enormous, and from the outside they can look identical. Four checks will tell you almost everything you need to know before you let anyone near your system.
Start with reviews, and read them. A company with hundreds of detailed reviews from local homeowners has a track record you can verify. Look past the star count at what people actually describe: did the crew show up on time, protect the home, explain the work, and leave it cleaner than they found it? We are proud of our 4.9-star rating across 291 Google reviews because every one of them came from a real job in Delaware.
Ask if they are insured, and do not be shy about it. A company working inside your home should carry liability insurance and be able to say so without hesitation. Then ask what the cleaning actually includes. A legitimate answer covers the whole system: supply runs, returns, registers, and the blower area, cleaned under negative air with before-and-after proof. A vague answer, or one that only mentions the vents you can see, is your sign to keep looking.
Ask how they quote. Honest companies ask questions about your home before naming a price: square footage, number of vents, number of systems, last cleaning. Coupon specials that advertise a whole house for pocket change make their money on upsells once they are inside, and the final bill rarely resembles the ad. The price should come from your house, not a flyer.
Ask about the process and the proof. Negative air containment keeps dust from blowing into your rooms. Before-and-after photos from inside the ducts prove the work happened. Any company reluctant to explain either one is telling you something.
Finally, ask how long they have been around. Duct cleaning has low barriers to entry, and the coupon crews come and go under new names. A company that has served the same communities for decades has a reputation to protect on every single job. We have served Delaware for over 40 years, and we plan to be here for the next 40. That matters when you want a company that stands behind the work.
Run those four checks on anyone you are considering, including us. If you like what you find, call (302) 378-7002 and we will answer every question on the list before we ever schedule the job.