Get matched with top water treatment pros in Bethesda, MD

"Enjoying our new water treatment system. Our old one was leaking. Now we have a new stainless steel system in our basement. Our salesman, Scott, was very friendly and helpful. I would recommend this company to anyone who us interested in a water treatment system."

"Previously, I had another system. The Hague uses a fraction of the salt that my previous system used - which mean less bags and less waste! The RO is even better! I never have to haul in 5 gallon bottles. Saves my back and the planet. All we use are reusable bottles now! My Hague RO water tastes so good - it is hard to drink other water."

"Repaired broken waterline and brought our water treatment unit up to snuff. Very satisfied"

"Very knowledgable and professional. Tech took the time to explain how the system works."

"The technician came on time and, although it took him longer than expected to install the system, he installed it and demonstrated the system for me. The next day, I noticed there was still water on the concrete close to the system but, I figured it was residual water. Apparently the system was leaking. Two days after install I contacted Leaf and advised them that the system was leaking. Early, the next business day, they arrived and repaired the leak and made sure I was happy. My system seems to be working well and I am satisfied."

"Services were prompt, clean and efficient. Tech was knowledgeable and personable. Water heater was affordable. Estimate (free) was done on site - not guessing over the phone."

"Remodeling work cause leakages in the gas lines. I made an appointment with the scheduler BUT Michael Bonsby called me to understand the problem and to explain/assure me that they would ensure a thorough check on the gas line/safety. Mark the specialist spent a good couple hours going through every corner of the gas/water lines and sent me a written report. And he spent time explaining the technical aspects so now I know how to maintain the system. Strongly recommend them for service. Good value to price. Peace of mind!"

Welcome to Markool Heating & Cooling. We proudly provide the highest quality of service and craftsmanship for each aspect of your project. Our depth of knowledge and experience solidify our belief that customer service stands as the highest priority. We eagerly look forward to working with you and making your vision a reality. Give us a call, text, or email today, and let us get started!

Whether you need a repair, preventive maintenance, or replacement, we are your plumbing, heating, and air conditioning service provider in the northern Virginia and surrounding areas. We invite you to give us a call!

"Great prices! The entire team was extremely easy to talk to and work with throughout the process (quote, scheduling, Q&A, install, etc.), and the job was done quickly and without a fuss. Whole house water system is working great and skins feels so much better, and the under sink RO water tastes great! Thanks, guys!"