Installing a new fireplace unit today is quite simple and there are many options available to suit your needs, space availability & budget. If you choose an insert option (electric or gas log), this will simply need to be placed within the existing masonry opening in order for it to work properly. For prefabricated units, however, installation may vary depending on how your home was built; whether or not the flooring above has proper insulation beneath it (for combustion air intake); if any modifications are required by local building codes; etc. Either way, hiring a professional chimney sweep company can help ensure that everything goes smoothly with no issues! Make sure their equipment complies with all safety standards by visiting their website or calling them today!