--- title: "Commercial HVAC in Middle TN | Root House Mechanicals" url: https://roothousemechanicals.com/commercial/hvac updated: 2026-09-29 business: "Root House Mechanicals" phone: "(615) 426-9344" text: "(615) 426-9344" email: info@roothousemechanicals.com hours: "Monday to Friday, 8 a.m. to 5 p.m." --- # Commercial HVAC services in Middle Tennessee > Root House Mechanicals handles commercial HVAC across Middle Tennessee: service and repair, rooftop and package unit replacement, ductless mini-splits, ductwork and tenant build-outs. The HVAC work is done by licensed and insured techs, and you have one point of contact. Call (615) 426-9344 or email the scope to info@roothousemechanicals.com. Heating and cooling service, replacements and build-out work for businesses across Middle Tennessee, with one point of contact from walkthrough to closeout. - Call (615) 426-9344 (Monday to Friday, 8 a.m. to 5 p.m.) - Text (615) 426-9344 - Email: info@roothousemechanicals.com ## What we do ### Service and repair Units that stop cooling or heating, iced coils, noisy blowers, tripped safeties and thermostats that don't hold temperature. We find the cause and give you the price before the repair starts. ### Replacements and upgrades Rooftop and package units, split systems and controls, replaced when repairs stop making sense, on a schedule you approve. [Package unit repair and replacement](https://roothousemechanicals.com/hvac/package-units) ### Ductless mini-splits Heating and cooling for a server room, an added office or any space the main system doesn't reach. [Ductless mini-splits](https://roothousemechanicals.com/hvac/ductless-mini-splits) ### Ductwork New, extended and resealed ductwork, with airflow balanced so each room gets its share. [Ductwork repair, sealing and installation](https://roothousemechanicals.com/hvac/ductwork) ### Tenant build-outs Ductwork, zoning and equipment for new tenant layouts, scheduled with the plumbing and electrical. ## Rooftop and package units A package unit holds the compressor, the coils and the blower, and often a gas heat section, in one cabinet. On commercial buildings it usually sits on the roof over a curb, with the ducts running down into the space. Smaller buildings sometimes have one on a slab beside the wall. Service covers filters, belts, coils, condensate drains, the refrigerant charge and the gas heat section. Replacement usually means a crane lift, and a curb adapter if the new unit's footprint doesn't match the old curb. Gas, power, controls and ductwork are reconnected, and most replacements need a permit and inspection. We'll tell you honestly whether a repair or a replacement makes more sense, and give you the price of each. Our [package unit repair and replacement](https://roothousemechanicals.com/hvac/package-units) page explains how these units work. ## HVAC for tenant build-outs A new floor plan changes where the air needs to go. Build-out HVAC work usually means adding or moving supply and return ducts, changing diffusers and grilles, and balancing airflow so each new room gets its share. Sometimes the existing unit can't keep up with the new layout, especially when part of the space becomes a kitchen, a server room or a crowded office. A load calculation shows whether you need a larger unit, an added zone, or a ductless mini-split for one room. The HVAC work is scheduled with the plumbing and electrical, so the three trades aren't working around each other, and it goes through the inspections the city or county requires. ## Who does the HVAC work? HVAC work on your job is done by licensed and insured techs. Scope, scheduling, questions and closeout all go through one point of contact at Root House. Root House Mechanicals is licensed and insured. Plumbing on the same job is done under Tennessee Limited Licensed Plumber 5279. ## How a commercial HVAC job works 1. **Walkthrough.** We look at the units and their nameplates, the ductwork you can see, the controls and how the space is used. 2. **Proposal.** A written scope and a firm price before any work starts, noting whether the job needs a crane lift, a permit or an inspection. 3. **Schedule.** We set dates with you around equipment lead times, the weather and any time the heat or cooling needs to be off. We work Monday to Friday, 8 a.m. to 5 p.m. 4. **Work.** Current methods, good equipment and quality materials, with one point of contact the whole way through. 5. **Closeout.** The equipment is started up and tested, we walk the work with you, and you get the manuals and any inspection records. ## How to request a bid Call or text (615) 426-9344 to talk it through, or email the scope with the details below. Nameplate photos let us look up the equipment before the walkthrough. - Business name - Property address - The units involved, with nameplate photos if you can get them - What's going on, or the scope you want built - Other trades involved, if any - Timeline - Drawings, for a build-out - Call (615) 426-9344 (Monday to Friday, 8 a.m. to 5 p.m.) - Text (615) 426-9344 - Email the scope to info@roothousemechanicals.com: info@roothousemechanicals.com ## Commercial HVAC questions ### Do you work on rooftop units? Yes. Service, repair and replacement of rooftop and other package units is part of the commercial HVAC work we handle. Send the make and model from the nameplate with your request. ### What does replacing a rooftop unit involve? Usually a crane lift, a curb adapter if the new unit's footprint is different, and reconnecting gas, power, controls and ductwork. Most replacements also need a permit and inspection. The proposal lays out each step and the price before work starts. ### How often should commercial HVAC equipment be serviced? A common schedule is one visit before cooling season and another before heating season, with filters changed more often. Equipment that runs hard, like kitchen or server room cooling, can need more. The maker's manual usually lists what each unit needs. ### Can you cool a server room or one hot office? Often, yes. A ductless mini-split can cool a single room the main system doesn't reach, or one that runs warm all the time, without changing the rest of the system. ### Will the heat or air be off during the work? For most repairs, only briefly. A replacement takes the unit offline for the change-out. We'll tell you how long in the proposal and set the timing with you.