Question 1

How long does a central AC installation typically take?

Accepted Answer

A straightforward replacement of an existing split system — same location, existing ductwork in good condition — can typically be completed in one day. New installations requiring ductwork modifications, new duct system design, or electrical panel work may take two to three days or more depending on the scope. Tandem Mechanical will give you a realistic project timeline during the proposal phase so you can plan accordingly.

Question 2

What size central AC system does my home need?

Accepted Answer

System capacity is determined by a Manual J heat gain calculation that accounts for your home's square footage, ceiling height, insulation levels, window area and orientation, local design temperatures, and occupancy. Rules of thumb like 'one ton per 500 square feet' are not reliable and frequently produce oversized systems that short-cycle, fail to dehumidify, and wear out prematurely. Tandem Mechanical performs proper load calculations on every installation project.

Question 3

My home has a boiler and no ductwork — can I still get central AC?

Accepted Answer

Yes, though it requires more planning. Options include installing a complete new duct system designed around your home's layout, using a ductless mini-split system for individual rooms or zones, or in some cases a combination approach where central ducted cooling serves main living areas and ductless units serve bedrooms or additions. Tandem Mechanical can evaluate your home and recommend the most practical and cost-effective path to whole-home comfort.

Question 4

What SEER2 rating should I look for in a new system?

Accepted Answer

SEER2 is the current federal efficiency standard for central AC equipment. Minimum federal standards vary by region, and equipment available in the Northeast typically ranges from the minimum-compliant rating up to 20 SEER2 or higher for premium variable-speed systems. Higher SEER2 equipment costs more upfront but reduces operating costs over the system's life. Tandem Mechanical will help you evaluate the payback period for higher-efficiency options based on your usage patterns and current utility rates.

Question 5

My existing system uses R-22 refrigerant. What are my options?

Accepted Answer

R-22 (commonly called Freon) production ended under EPA regulations in 2020, and remaining supplies are limited and expensive. If your R-22 system develops a refrigerant leak or compressor failure, replacement is almost always more economical than repair given current R-22 costs and the age of equipment still using it. Replacement systems use R-410A or the newer R-32 refrigerant, which are currently produced and available. Tandem Mechanical can assess your R-22 system and provide a replacement proposal.

Question 6

Do I need an electrical panel upgrade for a new central AC system?

Accepted Answer

It depends on your current panel capacity and the electrical requirements of the new equipment. Most central AC condensers require a dedicated 240-volt circuit with a breaker sized to the unit's minimum circuit ampacity. If your panel is already at capacity or is an older type not compatible with modern breakers, an upgrade may be required. Tandem Mechanical will assess your electrical service during the site visit and include any required electrical work in the project scope.

Question 7

Will you pull permits for the installation?

Accepted Answer

Yes. Tandem Mechanical pulls all required mechanical and electrical permits for every installation. Permitted work is inspected by your local building department, which protects you as the property owner by confirming the installation meets code. Unpermitted HVAC work can create complications with homeowner's insurance, property sales, and manufacturer warranties. We handle all permit applications and coordinate required inspections as part of our standard process.

Question 8

What happens to my old equipment?

Accepted Answer

Tandem Mechanical removes and disposes of your old central AC equipment as part of the replacement project. Refrigerant is recovered from the old system using certified recovery equipment in compliance with EPA Section 608 regulations — it cannot legally be released to the atmosphere. Recovered refrigerant is handled according to current environmental regulations, and old equipment is disposed of responsibly.

AC Replacement & Installation in Oakham, MA

AC Replacement & Installation in Oakham

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